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Chapter 33: Problem 26

What kind of lens is used in eyeglasses to correct the vision of someone who is a) nearsighted? b) farsighted?

Short Answer

Expert verified
Answer: To correct nearsightedness, a concave lens is used, while a convex lens is used to correct farsightedness.

Step by step solution

01

a) Nearsighted eyeglasses

A person who is nearsighted has difficulty seeing objects far away. Their eyeball is too long or the lens has too much curvature, causing light rays to converge before they reach the retina. To correct this, a diverging lens, which spreads out light rays, is required. The type of lens used to correct nearsightedness is a concave lens.
02

b) Farsighted eyeglasses

A person who is farsighted has difficulty seeing objects that are nearby. Their eyeball is too short or the lens doesn't have enough curvature, causing light rays to converge behind the retina. To correct this, a converging lens, which makes the light rays come closer together, is required. The type of lens used to correct farsightedness is a convex lens.

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Most popular questions from this chapter

LASIK surgery uses a laser to modify the a) curvature of the retina. b) index of refraction of the aqueous humor. c) curvature of the lens. d) curvature of the cornea.

As a high-power laser engineer you need to focus a 1.06-mm diameter laser beam to a 10.0 - \(\mu\) m diameter spot \(20.0 \mathrm{~cm}\) behind the lens. What focal length lens would you use?

Galileo discovered the moons of Jupiter in the fall of \(1609 .\) He used a telescope of his own design that had an objective lens with a focal length of \(f_{o}=40.0\) inches and an eyepiece lens with a focal length of \(f_{e}=2.00\) inches. Calculate the magnifying power of Galileo's telescope.

Two converging lenses with focal lengths \(5.00 \mathrm{~cm}\) and \(10.0 \mathrm{~cm}\), respectively, are placed \(30.0 \mathrm{~cm}\) apart. An object of height \(h=5.00 \mathrm{~cm}\) is placed \(10.0 \mathrm{~cm}\) to the left of the \(5.00-\mathrm{cm}\) lens. What will be the position and height of the final image produced by this lens system?

An object of height \(h\) is placed at a distance \(d_{0}\) on the left side of a converging lens of focal length \(f\left(f
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