Question

A Ray of light is travelling from air to water what is the angle of incidence in air if angle of refractive in water is 45 degree take refractive index of water 132​

Answer 1

Rarer Medium

The medium in which speed of light is faster, here air.

Denser Medium

The medium in which speed of light is slower, here water.

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Refractive Index = Sin i/Sin r

Refractive Index = 132

Sin r = Sin 45°

[Note : Sin 45° = 1/√2 or √2/2]

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➵ 132 = Sin i/Sin 45°

➵ 132 = Sin i/(√2/2)

➵ 132 = Sin i × 2/√2

➵ 132 × √2/2 = Sin i

➵ 66√2 = Sin i

Hence incident angle is 66√2 or 93° (approx).

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Answer : 93° (approx)

Answer 2

Answer:

68.4 degree

Explanation:

we know that η=\frac{sini}{sinr}   ----(1)

given r=45° η of  water=1.32

put value of r and refractive index in equation 1 and you will get the answer.

hope it helps