Question

A plano convex lens of refractive index 1.5 has a radius of curvature 10 cm. It is silvered on its plane surface. Find the focal length after silvering
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Answer 1

Answer:

focal length will be also 10 cm

Explanation:

use to formulas one is lens makers formula and other is silvered lens formula

Answer 2

The focal length after silvering is 10 cm.

Explanation:

Given that,

Refractive index = 1.5

Radius of curvature = 10 cm

We need to calculate the focal length after silvering

​Using formula of power

$P_{eq}=2P_{L}+P_{m}$

$P_{eq}=2(\mu-1)\dfrac{1}{R}+0$

$f=\dfrac{1}{P_{eq}}$

$f=\dfrac{R}{2(\mu-1)}$

Put the value into the formula

$f=\dfrac{10}{2(1.5-1)}$

$f=10\ cm$

Hence, The focal length after silvering is 10 cm.

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Topic : focal length

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