Q134 / 150 · MHT CET 2016 · Physics

A ray of light travelling through rarer medium is incident at very small angle $i$ on a glass slab and after refraction its velocity is reduced by $20 % .$ The angle of deviation is

A
$\frac{i}{8}$
Correct answer
B
$\frac{i}{5}$
C
$\frac{i}{2}$
D
$\frac{4 i}{5}$

Solution

As at interface, velocity of light reduces by

20 %

of C

∴ δ = 20 % i = \frac{20}{100} \times i = \frac{i}{5}

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

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