Q143 / 160 · AP EAMCET 2022 (04 Jul Shift 1) · Physics

A ray is incident from a medium of refractive index $2$ into a medium of refractive index $1$ . The critical angle is

Correct answer
A
$30 °$
B
$60 °$
C
$45 °$
D
$90 °$

Solution

Critical angle is defined as the angle of incidence, when light is travelling from denser medium to rarer medium, at which the angle of refraction is $90 °$ . Therefore,
$i_{c} = \sin^{- 1} (\frac{μ_{2}}{μ_{1}}) = \sin^{- 1} (\frac{1}{2}) = 30 °$

Hence, the correct answer is option: 'A'.

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A ray is incident from a medium of refractive index 2 into a medium of refractive index 1. The critical angle is

Solution

Relevant Questions

A ray is incident from a medium of refractive index $2$ into a medium of refractive index $1$ . The critical angle is