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Question 9 • Physical Science

Different kinds of lenses are used in eyeglasses to help people with eye conditions. Farsightedness is an eye condition in which distant objects appear clear but close objects appear blurry. Nearsightedness is an eye condition in which close objects appear clear but distant objects appear blurry. Which best describes the type of lens that would help someone with one of these eye conditions?

Answer
A
Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer.
B
Convex lenses would help someone who is nearsighted because the lenses can make objects look larger and farther away.
C
Convex lenses would help someone who is nearsighted because the lenses can make objects look smaller and closer.
D
Concave lenses would help someone who is farsighted because the lenses make objects look smaller and closer.

Explanation

Nearsightedness makes distant objects blurry because light focuses in front of the retina. A concave (diverging) lens spreads the incoming light so it focuses farther back, helping distant objects appear clear. Concave lenses also form smaller, upright virtual images, matching the description in choice A.

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