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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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A camera has a circular aperture immediately behind the lens. Reducing the aperture diameter to half its initial value will
A. Make the image blurry.
B. Cut off the outer half of the image and leave the inner half unchanged.
C. Make the image less bright.
D. All the above.
Explain your choice.
A scientist needs to focus a helium-neon laser beam to a spot behind a lens
(a) what focal-length lens should she use?
(b) what minimum diameter must the lens have?
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?
Ellen wears eyeglasses with the prescription.
a. What eye condition does Ellen have?
b. What is her far point without the glasses?
A -tall object is to the left of a lens with a focal length of. A second lens with a focal length ofis to the right of the first lens.
a. Use ray tracing to find the position and height of the image. Do this accurately using a ruler or paper with a grid, then make measurements on your diagram.
b. Calculate the image position and height. Compare with your ray-tracing answers in part a.
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