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Chapter 31: Problem 85

If a lens suffers from spherical aberration, stopping down will a. worsen the focus. b. improve the focus. c. not affect the focus.

Short Answer

Expert verified
b. Improve the Focus.

Step by step solution

01

Interpret Spherical Aberration

Spherical aberration in a lens causes light rays that pass near the edge of the lens to be focused at different points from light rays that pass through the center. The result is a blurry image with poor focus.
02

Understand Stopping Down

'Stopping down' a lens refers to reducing the aperture size. When the aperture is reduced, light from the edges of the lens, which would encounter more severe spherical aberration, is blocked.
03

Analyze the Effect of Stopping Down on Focus

When you stop down a lens, you limit the amount of the lens that light can enter through. This effectively reduces or eliminates the amount of light entering through the edges of the lens, thus reducing or eliminating the effects of spherical aberration. This will, in fact, improve the focus.

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Most popular questions from this chapter

Chromatic aberration results from variation of the refractive index with wavelength. Starting with the lensmaker's formula, find an expression for the fractional change \(d f / f\) in the focal length of a thin lens in terms of the change \(d n\) in refractive index.

You're an optician who's been asked to design a new replacement lens for cataract patients. The lens must be 5.5 mm in diameter, with focal length \(17 \mathrm{mm}\), and it can't be thicker than \(0.8 \mathrm{mm} .\) For the lens material, you have a choice of plastic with refractive index 1.49 or more expensive silicone with \(n=1.58 .\) Which material do you choose, and why?

Is the image on a movie screen real or virtual? How do you know?

Show that identical objects placed equal distances on either side of the focal point of a concave mirror or converging lens produce images of equal size. Are the images of the same type?

A particular eye has a focal length of \(2.0 \mathrm{cm}\) instead of the 2.2 \(\mathrm{cm}\) that would put a sharply focused image on the retina. (a) Is this eye nearsighted or farsighted? (b) What corrective lens is needed?
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