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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

Two distant stars are separated by an angle of 35 arcseconds. If you have a refracting telescope whose objective lens focal length is \(3.5 \mathrm{~m}\), what focal length eyepiece do you need in order to observe the stars as though they were separated by 35 arcminutes?

A camera has a lens with a focal length of \(60 . \mathrm{mm} .\) Suppose you replace the normal lens with a zoom lens whose focal length can be varied from \(35 . \mathrm{mm}\) to \(250 . \mathrm{mm}\) and use the camera to photograph an object at infinity. Compared to a 60.-mm lens, what magnification of the image would be achieved using the \(240 .-\mathrm{mm}\) focal length?

How large does a \(5.0-\mathrm{mm}\) insect appear when viewed with a system of two identical lenses of focal length \(5.0 \mathrm{~cm}\) separated by a distance \(12 \mathrm{~cm}\) if the insect is \(10.0 \mathrm{~cm}\) from the first lens? Is the image real or virtual? Inverted or upright?

An object is \(6.0 \mathrm{~cm}\) from a converging thin lens along the axis of the lens. If the lens has a focal length of \(9.0 \mathrm{~cm}\), determine the image magnification.

What type of lens is a magnifying glass? a) converging d) cylindrical b) diverging e) plain c) spherical
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