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Chapter 35: Q. 8 (page 1016)
To focus parallel light rays to the smallest possible spot, should you use a lens with a small f-number or a large f-number? Explain.
smaller f-numbered lens
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Once dark adapter, the pupil of your eye is approximately diameter. The headlights of an oncoming car are apart. if the lens of your eye is diffraction-limited, at what distance are the two headlights marginally resolved? assume a wavelength of and that the index of refraction inside the eye is
(Your eye is not really good enough to resolve headlight at this distance, due both to aberrations in the lens and to the size of the receptors in your retina, but it comes reasonably close.
A diffraction-limited lens can focus light to a 10diameter spot on a screen. Do the following actions make the spot diameter larger, make it smaller, or leave it unchanged?
A. Decreasing the wavelength of the light.
B. Decreasing the lens diameter.
C. Decreasing the lens focal length.
D. Decreasing the lens-to-screen distance.
A common optical instrument in a laser laboratory is a beam expander. one type of beam expander is shown in FIGURE P.
a. For what lens spacing d does a parallel laser beam exit from
the right?
b. What is the width of the exiting laser beam?
Suppose you wanted special glasses designed to let you see underwater without a face mask. Should the glasses use a converging or diverging lens? Explain.
Marooned on a desert island and with a lot of time on your hands, you decide to disassemble your glasses to make a crude telescope with which you can scan the horizon for rescuers. Luckily you’re farsighted, and, like most people, your two eyes have different lens prescriptions. Your left eye uses a lens of power and your right eye’s lens is . a. Which lens should you use for the objective and which for the eyepiece? Explain.
b. What will be the magnification of your telescope?
c. How far apart should the two lenses be when you focus on distant objects?
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