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Linear Magnification

Radius of cur...

Question

Radius of curvature of a concave lens is 60 cm. What is the focal length?

A

-30

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B

-60

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C

60

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D

30

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Solution

The correct option is A -30
Radius of curvature is twice the focal length for a spherical lens

Therefore the magnitude of the focal length will be 60/2 = 30 cm

As the lens in discussion is a concave one, the sign will be negative

Therefore the correct answer is D, -30 cm.

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