Question

Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?

A

11 cm

B

22 cm

C

7 cm

D

6 cm

Medium
Updated on : 2022-09-05
Solution
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Correct option is B)

Lens maker's formula,

Here, f = 20 cm, = 1.55, = R, = -R

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