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Home » 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 . The angle of deviation isA) B) C) D)
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}
B) \frac{\mathrm{i}}{5}
C) \frac{\mathrm{i}}{2}
D) \frac{4 \mathrm{i}}{5}
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}
B) \frac{\mathrm{i}}{5}
C) \frac{\mathrm{i}}{2}
D) \frac{4 \mathrm{i}}{5}

Answer is (B)
As at interface, velocity of light reduces by 20 \% of \mathrm{C}
\therefore \quad \delta=20 \% \mathrm{i}=\frac{20}{100} \times \mathrm{i}=\frac{\mathrm{i}}{5}

i

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