Question 3. The endemic regions were identified in Africas central and western areas. Give suitable examples of each objects. Mainly there are two types of object based on their light emitting property: Luminous Objects: An object which has a tendency to produce light are known as luminous objects. A shadow may be defined as the dark area caused by an opaque object when it prevents light from passing to the other side. Question 4. Why? When a ray of light falls on an opaque object, a dark patch is formed on the other side of the object whether it is on ground or it is on screen present on the other side of the object. In this case, the shadows formed are smaller in length and are cast directly underneath the objects mostly. When Parthiv asked the reason she said, today is solar eclipse at 2:15 p.m. Parthiv made her relaxed and said this is a natural phenomenon and nothing bad or unpleasant things are related to this. (d) Table, Question 8. Communication back in the 1860s was pretty primitive. With the help of a suitable diagram, show their formation. Answer: Wood and bricks are the substances through which light does not pass. Hence, for reflection, shiny surfaces are required. The shadow of a coloured object is also coloured. Answer: As when light falls on an object, light gets reflected and this reflected light comes to us which makes the object visible. The part of the shadow which occurs in the centre is called penumbra. Characteristics of shadow are as follows: 1. Note: Umbra and penumbra are formed only when an opaque object is placed in front of an extended source of light. Learn from their 1-to-1 discussion with Filo tutors. Answer: Method: Observation: The shadow becomes bigger when the object is moved closer to the torch and smaller when it is moved closer to the screen. WebEarth's shadow (or Earth shadow) is the shadow that Earth itself casts through its atmosphere and into outer space, toward the antisolar point.During the twilight period (both early dusk and late dawn), the shadow's visible fringe sometimes called the dark segment or twilight wedge appears as a dark and diffuse band just above the horizon, most (c) Opaque objects: Objects through which light cannot pass at all and through which we cannot see are called opaque objects. Image formed by a plane mirror is _________. (d) Soumen got upset easily without looking and inspecting the actual cause, he is bit careless in doing his activity. [1] [6] It can be used for the analysis of some small village houses. Is always black, regardless of the colour of the object. (a) inverted A shadow exists because the object absorbs the light. (d) all of these, Question 39. Sun rays falling on a flying bird form shadow in space. Example: Sun, bulb, etc. The objects which do not allow light to pass through them are called translucent objects. Explain its construction and image formation. . (d) all of these, Question 38. The property due to which light travels in a straight line is called rectilinear propagation of light. Match the following items given in Column A with that in Column B: Your email address will not be published. What is mirror? What type of images are formed by a pinhole camera? (c) translucent The shape of a shadow depends upon the shape of the object. that allows you to see things is called as light. This results in an area of darkness appearing behind the object. We can see through a translucent object but the vision would be murky. Plastic is opaque but glass is _________. Objects can be classified based on their interaction with light. (c) How does the formation of the image by a pinhole camera is affected by size of the hole? When a light ray returns back after striking the surface of the plane mirror is called (a) straight line(b) curved line(c) zig-zag line(d) randomly, (ii) When an opaque object comes in the path of light it forms, (a) an image with colours(b) shadow(c) black and white image(d) depends on the colour of the light. Translucent Object: An object which allows partial passage to light is called a translucent object. Question 3: Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way? Image is seen when light coming from the object after reflection or refraction enters the observess eye. (d) depends on the colour of object, Question 27. (c) both of these A shadow is formed when an opaque object comes in the path of light. (a) luminous Reflection occurs mainly on the mirror surface as incident light gets reflected when it falls on a clear surface and due to reflection the image formed is always erect. (a) copper Fill in Transparent Object: An Object through which light is completely passed known as transparent object. What are the different types of object based on their ability to pass the light? E.g. (a) Transparent objects: Objects through which light can pass easily are called transparent objects, e.g., clean glass, clean water, clean air, etc. Question 16. (b) a coloured image (a) dark (black) There are three different forms of. Answer: Correct Answer: Sun and Earth. An object which does not allow light at all to pass through it, is called opaque object, e.g., wooden sheet, wall, etc. A silvered glass has a smooth surface which helps in forming clear image. Mirror does not change the direction of light that falls on it. No, the colour of the object does not affect the colour of the shadow. (b) incident ray He rectified Soumens mistake and helped him making another pinhole camera. Answer: An object which comes to the path of light is called an obstacle. Question 8. It is formed when light hits the opaque object which does not let the light pass through. We can define shadow as A shadow is a dark region behind an opaque object where light is blocked by the object. The dark area is called a shadow. An object which allows partial passage to light is called a translucent object. Opaque Object: An object which does not allow passage to light is called an opaque object. (a) inverted Answer: Opaque: A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, kerosene stove, sun, firefly, moon. Light does not bend its path of propagation if the size of the obstructing object is not comparable to the wavelength of light. Do you notice any difference? The plane mirror shines due to the silver coating. 2. The image formed in water is Example: Sun, bulb, etc. The colour of the shadow is always black. Air and water are translucent objects. The : Earth, trees, Transparent objects allow light to pass through them without getting scattered. Question 6. (a) transparent objects The phenomenon of light bouncing off surfaces is called reflection. This phenomenon is a. What are the essential conditions for formation of shadows? Answer: WebHow shadows are formed. (d) black, Question 35. Butter paper is a . Question 5. Answer: (d) none of these, Question 9. A shadow is the cross section of that volume of light in the form of a two-dimensional silhouette, or an inverse projection of the person or the object obstructing the propagation of light in space.Shadow demonstrating transverse reversal effect. (c) a black and white image What is reflection? As the length of the shadow is directly proportional to the cotangent of the elevation angle, we can say that in this case the shadows are very long. From the critical perspective, this study investigated the role of private tutoring in a context of high-stakes testing through Interpretative The following three things are required for a shadow to form (Fig. Wood, metals, clay and black paper. What happens when light falls on a mirror? As we know, the length of the shadow is proportional to the cotangent of the angle of elevation, we can say that, Ans. What type of images is formed by it? What do you see? What is a translucent object? Question 27. The size of the shadow depends upon the size of the object, the distance between light source and object and the distance between object and the screen. These two regions in shadows are formed when an opaque body is placed in front of an extended or slit source. A rain shadow forms when moist winds head towards a set of mountains and get forced upwards by them. Question 11. It is formed when light ray falling on the surface of the mirror (say an opaque object) is blocked by it. Question 26. A torch is a Question 4: In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror? What are transparent objects? (d) none of these, Question 4. (a) erect E.g. of the object. What information does a shadow give about an object? Why is the moon not considered as a luminous body? (c) both of these Why is a silvered glass used as a mirror? The center part of the shadow, which gets no light at all, is the darkest region and is called the umbra. It is the outer part of a shadow. Features of Image Formed Due to Reflection: Ans. Question 2. lateral dispersion reflection rectilinear propagation diversion Viewed by: 0 students Updated on: Feb 19, 2023 1 student asked the same question on Filo Learn from their 1-to-1 discussion with Filo tutors. Question 12. Classify Objects Based on its Light Producing Property? Luminous: A piece of red hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, firefly. All the space behind the opaque object up to some distance behind it seems to be filled with the shadow. His elder brother on observing his pinhole camera found that the hole made by him was quite large. A pinhole camera is a simple camera that consists of a light-proof box, a thin film for a screen and a small aperture or hole to allow the passage of light rays. Question 11. However, the infection started to spread in 2017 to non-endemic regions such as North and South America, Europe, and Asia. Name sources of light that are not hot. : Sun and other stars, Objects that do not produce their own light but reflect the light emitted by luminous objects are known as non-luminous objects. (b) Why do you think that some people believe that these eclipses will have some bad effect on them? Since May 2022, What is a transparent object? Answer: How does light travel? Answer: There are two types of eclipse. A shadow, which is projected over an area at large distances (like light years) is unable to communicate information between the surfaces at such distances with the edge of the shadow. When the object moves, its shadow is likely to expand in terms of dimensions faster than the speed of the objects movements. Match the items given in column I suitably with those given in column II. Light, Shadows and Reflections Class 6 notes - Chapter 11 - BYJUS Soumens teacher asked their class to make a pinhole camera by themselves. WebShadows are formed because: A Opaque bodies allow the light to pass through them B Light can bend around the opaque bodies C Light rays cannot pass through the opaque The shape of shadow depends upon the (a) shape of the object (b) size of the object (c) size of source of light (d) colour of the source light Answer Question 22. When a ray of light falls on a surface like glass which has shiny and glossy properties from where light gets reflected. Classification of Object Based on Tendency to Produce Light. What is a shadow? Source of light which is already present in nature known as natural source of light. Answer: When a ray of light falls on a smooth and shiny surface, the whole of light is sent back in the same medium. Question 19. Some objects are opaque such as stone, metal and wood. Shadow is formed due to the phenomenon of rectilineas propryation of light. What can you say about the ability of such clouds to transmit light? The size of a shadow depends on the size of the object. The object that does not give out light on its own is the (a) Rectilinear propagation of light It is only a dark region having no colour. the contrast between the shadow and the surrounding area is much more and therefore, we can clearly see the shadow formation. (b) red The term rain shadow is also used in such a context. Required fields are marked *, Chapter 11: Light Shadows And Reflections, Frequently asked Questions on CBSE Class 6 Science Notes Chapter 11: Light Shadows and Reflections. Shadows are formed when an _________ object comes in the path of light. Shadow of an object is always Which of the following are transparent or allows light to pass through it? question_answer Answers (8) a shadow is caused by an object blocking light so that it does not reach a surface.The area in shadow appears black because there is no light falling on it----it appears dark. (d) What value of Parthiv is shown here? Question 29. Question 13. Question 25. For example, right side of the object appear as left side in the image. Answer: Ans. (c) incident ray Question 10. It can be smaller than object, bigger than object or same size to object. The moon is a non-luminous body. (b) translucent object (d) diminished, Question 21. Why shadows are black in colour? We cannot see through an opaque object. Answer: The silvered glass has a smooth surface and the smoothness helps in forming clear image. (d) none of these, Question 23. (b) Why was Soumen unable to get the image of a well lit object? What change in the path of light takes place when light falls on a shiny surface? This dark region is called a shadow. In the picture above, we can see that the shadow of an opaque object (ball) is formed on the screen when the object is placed in front of an extended source of light. Answer: It is a device which forms a photograph like image of a bright object on a screen. Can you think of a situation where we can see the path of the light? A mirror reflects a beam of light. Answer: In a pinhole camera, image formed is inverted because the object is between radius of curvature and focus. A mirror is an example of Q.9) If you stand before a plane mirror, your left hand appears right. Solution For Shadow is formed due to the phenomenon of rectilineas propryation of light. Question 3. Shadows do not give us any information about the shapes of objects. Pinhole camera is made up of translucent butter paper. From the critical perspective, this study investigated the role of private tutoring in a context of high-stakes testing through Interpretative Answer: A smooth shining surface, which rebounds the light back in same or in different direction is called a mirror. When l = 0 or 0.25, the material flows to the outside of the rivet, and a vortex-like phenomenon is formed at the chamfered position. What is the size of the image formed by a plane mirror? Question 27. WebThis forms areas that are lighted, and an area that isn't. Far the source of light is, smaller is the shadow. Parallel lines are two straight lines that are always the same distance apart. Even during the night time which we perceive to be dark there is light from various sources like stars, the moon, street lights, and ambient city lights reflecting off clouds, etc. Cot() = L/20mif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'lambdageeks_com-leader-1','ezslot_8',838,'0','0'])};__ez_fad_position('div-gpt-ad-lambdageeks_com-leader-1-0'); Your email address will not be published. It is time to put your knowledge to the test by answering a few questions. ), Element 115, Moscovium:7 Interesting Facts. Answer: When an opaque object is placed in its way, a dark patch is formed behind the object. The wall or ground behind the opaque object is the screen. This dark patch is called shadow. Question 6. Moon is a non-luminous body though it glows. Since the man and the tree is on the same surface they must be facing the same elevation angle from the light source. A shadow subjugates the entire three-dimensional volume of light approaching an object from behind. On which property of light a pinhole camera does work? An area of darkness formed by an opaque object obstructing light is called a shadow. The phenomenon due to which light returns back after striking a highly polished surface is called _________ of light. Answer: 4. The formation of shadow shows that light travels in a straight line. Example: moon. A building having the height of 20m casts a shadow on the ground. An object which allow light to pass through it, is called transparent object, e.g., clear glass, water, etc. The working of a pinhole camera is based on the property of _________ propagation of light. The light from outside enters through the small hole and forms an image on the screen that is inverted. This explains why we cannot see a shadow in the dark. (b) Translucent objects: Objects through which light can pass partially and through which we cannot see clearly are called translucent objects, e.g., greased paper, wax paper, butter paper, etc. An image is different from a shadow. (c) A thin iron sheet About Us Become a Tutor Blog. The following three things are required for a shadow to form: a source of light. Objects that emit light and heat are known as luminous objects. A shadow gives information about the shape of the object. It allows geologists to analyze the distinguishing geological features and structures, plant cover, past history of the site, soil properties, and topography of the study area. If we try to view the object and the source from the apex of the cone, then the two bodies would seem to be of the same size. Answer: Those objects which allow light rays to pass through them completely are called transparent objects. Suggest any two ways to do it. (a) transparent The word penumbra originated from the Latin word paene which means almost or nearly. Stars are We can observe the appearance of shadows in the dark because the is light present in what we perceive as dark. object. Diffusion of light. In solar eclipse moon is between a. the sunlight falls normally or orthogonally on the object (this is possible only in the region between the Tropic of Capricorn and Tropic of Cancer), then the angle of elevation becomes equal to 90, and cot() = 0. Question 7. Translucent: A sheet of polythene, smoke, a sheet of plane glass, fog, a sheet of cellophane, a wire mesh. Question 8. Question 3. Light falls on the hole, and an inverted image is formed on the side opposite to the hole. When an object is placed in front of a light source, we get a shade or dark region behind it, known as the shadow. Shadows are formed by light, because if light shines onto an object, and the object blocks the light, the light will go sideways of the object, and therefore, a shadow is formed. Most shadows are made up of the umbra and the penumbra. All light is blocked by an opaque object in the umbra. Table, chair, blackboard and notebook. It is always black, regardless of the colour of the object used to make the shadow. The antumbra refers to the portion of the shadow from which the obstructing object appears to be placed completely within the central region of the light source. What is natural pinhole camera? (a) transparent object about 384,402 km or 238,856 mi. The size of the umbra and penumbra depends on various factors such as the size of the source, size of the object, and the distance between the source and the object as well as the distance between the object and the screen. (c) circle It is a form of energy which makes objects visible as we cannot see objects in darkness.During day time sunlight acts as a source of energy which makes everything visible whereas at night we use artificial sources of light for seeing objects. A pinhole camera is a device which forms a photographic image of a bright object on a screen. Question 28. What type of images is formed by it? This concept is well proved with a smaller size of shadow in the evening and noon and bigger size of shadow in the morning. Features of Image Formed Due to Reflection. Answer: Answer: Why do we need a shiny surface for reflection? What do we need in order to see a shadow? Compare it with your image as you see it in a mirror. Question 22. Based on the size of the light, the sharpness of shadow is observed. Shadows are formed because the movement of particles travels in light. Similar to the sunlight, the particles travel and choose a destination. If the destination is an opaque substance, it creates a blurred image based on the object's size. What is an opaque object? Question 2. (a) Translucent(b) Opaque(c) Transparent(d) Penumbra. The phenomenon of formation of shadows of celestial bodies on one another is called an eclipse. (d) Wood, Question 13. Give four examples of non-luminous objects. (b) long On dark nights a little illumination by moon enables us to see things around us. Your Mobile number and Email id will not be published. Answer: Since then, the incidence of the disease has been sporadic. (d) none of these, Question 25. WebA shadow is actually just a space or region, where there is no light since an opaque object is blocking light rays. Have you ever made the shadows of different animals like dogs, camels or butterflies with your hands on the wall of your room? Answer: Mirror is silvered on one side, so it does not allow the light to pass through it. What are translucent objects? It can cause a shadow on chest X-rays. We cannot see through an opaque object. What would be the length of the shadow of an 8ft tree place in the same surface as that of the man. In a plane mirror our left hand looks like right hand. (a) shape of the object Answer: (b) opaque To know more about Reflection on a Plan Mirror, visit the link below; Learn more about the Light, Shadows, and Reflections from the topics given below: The energy derived from the sun, a lamp, etc. This is called lunar eclipse. NCERT solutions for class 6 science Chapter 11 contain various type of questions like match the following, fill in the blanks, MCQ and long answer questions. Moon reflects the light of sun in the night. As we know, the length of the shadow is proportional to the cotangent of the angle of elevation, we can say that. 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