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Use the mirror equation to deduce that: a convex mirror always produces a virtual image independent of the location of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Use the mirror equation to deduce that: the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the

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Use the mirror equation to deduce that: an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image. [Note: This exercise helps you deduce algebraically properties of images that one obtains from explicit ray

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A small pin fixed on a table top is viewed from above from a distance of 50cm. By what distance would the pin appear to be raised if it is viewed from the same point through a 15cm thick glass slab held parallel to the table? Refractive index of glass = 1.5. Does the answer depend on the location of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) Fig. shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.(ii) What is the answer if there is no outer covering of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: A virtual image, we always say, cannot be caught on a screen. Yet when we ‘see’ a virtual image, we are obviously bringing it on to the ‘screen’ (i.e., the retina) of our eye. Is there a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter to the diver than what he actually

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Explain: Does the apparent depth of a tank of water change if viewed obliquely? If so, does the apparent depth increase or

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Explain: The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond

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The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses. Determine the ‘effective focal length’ of the combination of the two

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? An object 1.5 cm in size is placed on the side of the convex lens in the arrangement above. The distance between the object and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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At what angle should a ray of light be incident on the face of a prism of refracting angle 60° so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will deviate a pencil of white light without much

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will disperse (and displace) a pencil of white light without much

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For a normal eye, the far point is at infinity and the near point of distinct vision is about 25cm in front of the eye. The cornea of the eye provides a converging power of about 40 dioptres, and the least converging power of the eye-lens behind the cornea is about 20 dioptres. From this rough data estimate the range of accommodation (i.e., the range of converging power of the eye-lens) of a normal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A myopic person has been using spectacles of power –1.0 dioptre for distant vision. During old age he also needs to use separate reading glass of power + 2.0 dioptres. Explain what may have

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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