A light is travelling from air a medium the velocity of light in a medium is reduced to to 0.75 times the velocity n air assume that angle of incidence I is very small the deviation of the ray is

Options

A. i
B. `(i)/(3)`
C. `(i)/(4)`
D. `(3i)/(4)`

Answer

C

Explanation

`mu = (sin i)/(sin r) = (V_(a))/(V_(m)) = (V_(a))/(0.75 V_(a)) = (100)/(75) = (4)/(3)`
i.e., `(i)/(r) = (4)/(3) :. r = (3i)/(4)`
Now `delta = i-r = i-(3i)/(4) = (i)/(4)`