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Chapter 25: Q25CQ (page 928)
Can a case 1image be larger than the object even though its magnification is always negative? Explain.
Yes, in case one, the image will be larger than the object instead of magnificent being negative.
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A light ray entering an optical fibre surrounded by air is first refracted and then reflected as shown in Figure 25.56. Show that if the fibre is made from crown glass, any incident ray will be totally internally reflected.
Figure 25.56A light ray enters the end of a fibre, the surface of which is perpendicular to its sides. Examine the conditions under which it may be totally internally reflected.
You can often see a reflection when looking at a sheet of glass, particularly if it is darker on the other side. Explain why you can often see a double image in such circumstances.
Your camera’s zoom lens has an adjustable focal length ranging from to mm. What is its range of powers?
Use the law of reflection to prove that the focal length of a mirror is half its radius of curvature. That is, prove that .Note this is true for a spherical mirror only if its diameter is small compared with its radius of curvature.
A camera with a \(100{\rm{ }}mm\)focal length lens is used to photograph the sun and moon. What is the height of the image of the sun on the film, given the sun is \(1.40 \times {10^6}{\rm{ }}km\) in diameter and is \(1.50 \times {10^8}{\rm{ }}km\) away?
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