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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

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

For a microscope to work as intended, the separation between the objective lens and the eyepiece must be such that the intermediate image produced by the objective lens will occur at a distance (as measured from the optical center of the eyepiece) a) slightly larger than the focal length. b) slightly smaller than the focal length. c) equal to the focal length. d) The position of the intermediate image is irrelevant.

Two identical thin convex lenses, each of focal length \(f\), are separated by a distance \(d=2.5 f\). An object is placed in front of the first lens at a distance \(d_{\mathrm{a}, 1}=2 f .\) a) Calculate the position of the final image of an object through the system of lenses. b) Calculate the total transverse magnification of the system. c) Draw the ray diagram for this system and show the final image. d) Describe the final image (real or virtual, erect or inverted, larger or smaller) in relation to the initial object.

Is it possible to start a fire by focusing the light of the Sun with ordinary eyeglasses? How, or why not?

Which one of the following is not a characteristic of a simple two-lens astronomical refracting telescope? a) The final image is virtual. b) The objective forms a virtual image. c) The final image is inverted.
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