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%.
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
A. `i/8`
B. `i/5`
C. `i/2`
D. `(4i)/5`
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Correct Answer - B
According to question, at glass-air interface velocity is reduced by 20% of the velocity of light.
So, deviation =20% of I
= `(20xx i)/(100)=(i)/(5)`
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