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Chapter 25: Q22PE (page 930)
An optical fibre uses flint glass clad with crown glass. What is the critical angle?
The critical angle is .
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A camera lens used for taking close-up photographs has a focal length of 22.0 mm. The farthest it can be placed from the film is 33.0 mm.
(a) What is the closest object that can be photographed?
(b) What is the magnification of this closest object?
A narrow beam of light containing red (\(660{\rm{ }}nm\)) and blue (\(470{\rm{ }}nm\)) wavelengths travels from air through a\(1.00{\rm{ }}cm\)thick flat piece of crown glass and back to air again. The beam strikes at a\({30.0^ \circ }\)incident angle. (a) At what angles do the two colors emerge? (b) By what distance are the red and blue separated when they emerge?
Suppose Figure 25.54represents a ray of light going from air through crown glass into water, such as going into a fish tank. Calculate the amount the ray is displaced by the glass , given that the incident angle isand the glass is1.00 cmthick.
Under what circumstances will an image be located at the focal point of a lens or mirror?
Can you see a virtual image? Can you photograph one? Can one be projected onto a screen with additional lenses or mirrors? Explain your responses.
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