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Question

Critical angle for a light ray travelling from denser to rarer medium is defined as the angle of incidence at which the angle of refraction is 90°.
If a ray of light travels from water (μw) to air (μa). Find the critical angle?

A

sin1(μwμa)

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B

sin1(μaμw)

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C

cos1(μwμa)

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D

90

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Solution

The correct option is B

sin1(μaμw)



Applying Snell's law at interface:
μwsinic=μasin(90)
ic = sin1(μaμw)

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