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The radius of curvature of the curved su...

The radius of curvature of the curved surface of a plano-convex lens is `20 cm`. If the refractive index of the material of the lens be `1.5`, it will

A

30 cm

B

50 cm

C

20 cm

D

40 cm

Text Solution

Verified by Experts

The correct Answer is:
D
`(1)/(f) (n-1) ((1)/(R_(1)) - (1)/(R_(2)) )`
= (1.5- 1) `((1)/(20) - (1)/(infty) ) rArr f = 40 ` cm.
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