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Combinations of Lenses & Mirrors

A Plano conve...

Question

A Plano convex lens is made of glass of refractive index 1.5.The of curvature of its convex surface is R. Its focal length:

A

R/2

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B

R

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C

2R

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D

1.5 R

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Solution

The correct option is A 2R

Given,

Radius of curvature, $R$
Refractive index = $1.5$

Focal length of lens, $f = \frac{R}{(μ - 1)} = \frac{R}{(1.5 - 1)} = 2 R$

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