A parallel beam of light falls on a solid transparent sphere of radius $R$ . If the incident beam is focussed at A, then find the refractive index of the sphere.

1.5

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1.7

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2.0

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2.5

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Solution

The correct option is C $2.0$
$u = - i n f i n i t y$ ; $v = + 2 R$ ; $R = + R$

$\frac{μ_{2}}{v} - \frac{μ_{1}}{u} = \frac{μ_{2} - μ_{1}}{R}$

$\frac{μ}{2 R} = \frac{μ - 1}{R}$

$μ = 2$

option $C$ is correct

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A parallel beam of light falls on a solid transparent sphere of radius R. If the incident beam is focussed at A, then find the refractive index of the sphere.

The correct option is C 2.0u=−infinity ; v=+2R ; R=+Rμ2v−μ1u=μ2−μ1Rμ2R=μ−1Rμ=2option C is correct

A parallel beam of light falls on a solid transparent sphere of radius $R$ . If the incident beam is focussed at A, then find the refractive index of the sphere.

The correct option is C $2.0$
$u = - i n f i n i t y$ ; $v = + 2 R$ ; $R = + R$

$\frac{μ_{2}}{v} - \frac{μ_{1}}{u} = \frac{μ_{2} - μ_{1}}{R}$

$\frac{μ}{2 R} = \frac{μ - 1}{R}$

$μ = 2$

option $C$ is correct