Home Physics Ray Optics Refraction at Spherical Surfaces and by Lenses If a person can not see objects beyond 40 cm…
Physics Ray Optics Refraction at Spherical Surfaces and by Lenses MCQ (Single Correct)

If a person can not see objects beyond 40 cm , then power and type of lens by which he can clearly see distant objects is

A
-2.5 D and concave lens
B
-2.5 D and convex lens
C
-3.5 D and concave lens
D
-3.5 D and convex lens

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Text Solution

Verified by Experts
The correct answer is:
A

We will use a concave lens which will from the image of distant object at 40 cm from the eye
So, and

By lens formula, we have

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