Chapter 35: Q.1. (page 1016)
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.
Glasses with converging lenses
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| 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 youโre farsighted, and, like most people, your two eyes have different lens prescriptions. Your left eye uses a lens of power +4.5 D, and your right eyeโs lens is +3.0 D. 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?
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.
A common optical instrument in a laser laboratory is a beam expander. One type of beam expander is shown in FIGURE P35.29.
The parallel ray of a laser beam of width enter from the left.
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?
A friend lends you the eyepiece of his microscope to use on your own microscope. He claims the spatial resolution of your microscope will be halved, since his eyepiece has the same diameter as yours but twice the magnification. Is his claim valid? Explain.
In FIGURE P, what are the position, height, and orientation of the final image? Give the position as a distance to the right or left of the lens.
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