Bi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have_______
P. nearsightedness Q. farsightedness R. night blindness

Only P

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Only Q

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Only R

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Both P and Q

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Solution

The correct option is D Only R
Bi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have night blindness.

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Question 7

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Q. Question 4
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Bi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have_______P. nearsightedness Q. farsightedness R. night blindness

The correct option is D Only RBi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have night blindness.

Bi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have_______
P. nearsightedness Q. farsightedness R. night blindness

The correct option is D Only R
Bi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have night blindness.