Question

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
A. `delta=i`
B. `delta=(i)/2`
C. `delta=(i)/4`
D. `delta=2r `

Answer 1

Correct Answer - C
`(V_a)/(V_m)=(sin i)/(sin r) :. (V_a)/((3)/(4)V_a)=(i)/(r)=(4)/3`
`:. 3i=4r :. r=(3)/4 i `
`delta=i-r :. delta=i-(3)/4 i=(i)/(4)`