The shadow we see while in the path of totality is called the umbra, and the shadow of the surrounding partial eclipse is a penumbra. E.g. Objects that give out or emit light of their own are called __________ objects. Answer: The light comes back in the same plan when light falls on a shiny surface. Ans. An image is different from a shadow. Far the source of light is, smaller is the shadow. Give four examples of translucent object. 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. In other words, a shadow of an object is a dark image formed by the obstruction of light caused by the object. WebHow shadows are formed. (c) circle We can clearly see through a transparent object. A shadow refers to a dark real silhouette of a person or an opaque object that is generated when the object or person obstructs the light coming from a light source. (a) luminous When a light ray returns back after striking the surface of the plane mirror is called (d) none of these, Question 33. This is known as reflection of light. the contrast between the shadow and the surrounding area is much more and therefore, we can clearly see the shadow formation. 13.4): a source of light; an opaque object; a screen or irface behind the object. A plate or any translucent sheet on the side opposite to the face containing the pinhole serves as a screen. We can see only in the presence of light. This phenomenon is a. Question 12. (b) size of object It is used to view objects like trees and buildings. (b) Why do you think that some people believe that these eclipses will have some bad effect on them? The sky appears to be blue in color due to the same property. Translucent: A sheet of polythene, smoke, a sheet of plane glass, fog, a sheet of cellophane, a wire mesh. (a) transparent object 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. (b) reflection (a) transparent A shadow is formed when light hits an opaque object which stops the rays of light from passing through it. Question 17. Total classes on Filo by this tutor - 2948, Connect with 50,000+ expert tutors in 60 seconds, 24X7. Light travels in a _________ line. One can see clearly through these objects. The penumbra is often rightly termed as a subset of the umbra as it represents the portion of the shadow that is formed by some part of the source of light is obscured. So it is a non-luminous body. Required fields are marked *. For a round body that obstructs around source of light, the umbra formed has the shape of a right circular cone. Answer: The objects which emit light of their own are called luminous bodies, e.g., the sun, the stars, etc. By covering one side of the glass sheet by butter paper. 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. The following three things are required for a shadow to form: a source of light. His elder brother on observing his pinhole camera found that the hole made by him was quite large. Try to see a source of light; like a bulb or a candle; through the straight tube. Why is a silvered glass used as a mirror? Distinguish between luminous and non-luminous objects? Lateral inversion means the apparent reversal of the mirror images when compared with the object. Question 24. Question 12. (viii) Which is a device to image the sun? The inner region of a shadow which is completely dark is called umbra and the outer region surrounding the umbra which is a partially dark region is called penumbra. the light ray falling on the opaque object is blocked by it. An object which does not have a tendency to produce light known as a non-luminous object. This enables us to see images. object. Answer: How shadow changes with variation in daytime? Sun is the universal source of light. The generation of complex multicolored shadows is observed by visual artists that generally arise from colored light emitted or reflected back from different sources. Plastic is opaque but glass is _________. (a) circular A shadow generally takes up most of the space behind an opaque item with light right in front of it. Now connect to a tutor anywhere from the web. Question 4. (d) none of these, Question 25. (d) none of these, Question 12. An object which allow light to pass through it, is called transparent object, e.g., clear glass, water, etc. The formation of shadow shows that light travels in a straight line. WebA shadow refers to a dark real silhouette of a person or an opaque object that is generated when the object or person obstructs the light coming from a light source. Candle, bulb, kerosene oil, lamp and torch. Question 4. Explain its construction and image formation. (c) eclipse Name sources of light that are not hot. Find an answer to your question of light. Answer: It is a device which forms a photograph like image of a bright object on a screen. Answer: The colour of opaque objects affect the dark colour of the shadow. (d) none of these, Question 26. (a) Electric bulb Question 11. Question 12. Question and Answer forum for K12 Students. It is formed when light hits the opaque object which does not let the light pass through. Question 24. An object which allows partial passage to light is called a translucent object. Luminous objects: An object which has a tendency to produce light are known as luminous objects. When an object is placed in front of a light source, we get a shade or dark region behind it, known as the shadow. Note the colour and the size of the shadow. : Earth, trees, Transparent objects allow light to pass through them without getting scattered. (d) none of these, Question 16. WebShadow: Image is formed due to reflection or refraction of light: Shadow is formed when light falls on the opaque body. (b) opaque object Filo instant Ask button for chrome browser. Or, it can even mislead us about the shape of different objects. Question 22. 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. Then an image is observed similar to the one given : We observe that the light gets reflected from this mirror and it travels in straight lines. An object which has a tendency to produce light are known as luminous objects. It is crucial in the early stage of a geological mapping as it is less time (c) both (a) and (b) Question 9. A shadow has the following three characteristics: A very interesting phenomenon occurs when an object forms an image by reflection. : Butter paper, Opaque objects do not allow any light to pass through them. (c) surface The worlds only live instant tutoring platform. The diameter of the Earth is about 3.7 times that of the Moon, therefore, the umbra ranges respectively beyond an estimated 1.4 million km or 870,000 mi. (a) Transparent objects: Objects through which light can pass easily are called transparent objects, e.g., clean glass, clean water, clean air, etc. Example: Sun, bulb, etc. An object which allows only a small part of light through it, is called translucent object, e.g., wax paper, fog, etc. The moon is a non-luminous body. What is a translucent object? Images gives more information about the objects such as colour, structure, etc., whereas shadows do not provide such information. What is natural pinhole camera? Plywood sheet is a/an We can see through a translucent object but the vision would be murky. It is important for the students to go through these NCERT solutions to get knowledge of the type of question asked in the chapter. (a) size of object The colour of the opaque object does not affect the colour of the shadow that is formed. Question 1. WebPrivate tutoring is one of the unintended outcomes of high-stakes testing and has become a widespread global phenomenon. Shadows will always be formed on the opposite side of the light source. How does it works? When the sun is located directly overhead i.e. This is something all of us must have noticed while seeing ourselves in the mirror. __________ helps us to see objects. Translucent Object: An object which allows partial passage to light is called a translucent object. Answer: We may say that clouds behave as translucent object. (a) shape of the object Question 22. (c) a black and white image The following three things are required for a shadow to form (Fig. (c) opaque Eventually, we can observe that if the height of the fence is not enough, then the pattern of light would move towards the shadow diamonds and light outlines. [1] [6] It can be used for the analysis of some small village houses. b. Question 2. Pinhole cameras consist of a closed box having a small pinhole in the front and having translucent screen at the back. (b) incident ray Source of light which is prepared by humans is known as man made source of light. Light travels in a curved line. (b) The light ray returning back in the same medium after striking a smooth, shiny and highly polished surface (say a plane mirror) is called reflected ray. 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. Answer: (b) long You are saying that shadows should not exist due to Hyugens principle, but in fact, the new wave fronts are less energetic than the previous one. Filo instant Ask button for chrome browser. (d) no image, Question 20. . Question 5. (c) both (a) and (b) The human monkeypox virus (MPXV) was first identified in 1959. Answer: What are transparent objects? When an opaque object comes in the way of light it makes The images formed by a mirror are erect and laterally inverted. (b) straight line Answer: Give examples of two substances through which light does not pass? Shadow. What is a transparent object? Question 9. An object which is known as a source of light. Question 7. Closer the source of light, larger will be the size of the shadow. Air and water are 11 Facts On Wind Energy (Beginners Guide! of light. For example, we often observe that on a sunny day the shape and size of our shadows change. (b) A thin paper sheet Objects which does not allow light to pass through them are called On the basis of ability to pass light through an object, objects are classified into three main groups, i.e., A mirror is an example of (c) light bulb Once the tube is bent at some angle, it is not possible to see the source of light through it. Since May 2022, A shadow is always formed on the side opposite to the source of lightwith respect to an opaque object. Question 1. Objects that do not have light of their own are called __________ objects. 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