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Q.

Refractive index of water with respect to air is $\sqrt{2}$ . A light ray is incident on the surface at an angle 60⁰ travelling through water. The deviation of light ray is

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a

30°

b

120°

c

60°

d

0°

answer is D.

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Detailed Solution

Travells from water to air $μ = \frac{1}{\sin c}$
$\sin c = \frac{1}{μ} = \frac{1}{\sqrt{2}}; c = 45^{0}$
here i $= 60^{0}, i.e i > c ∴$ light Reffects into The same medium
$d = 180^{\circ} - 2 i$
$= 180^{0} - 2 \times 60 = 60^{0}$
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