A light ray enters from medium A to medium B as shown in the figure. The refractive index of medium B relative to A will be

Options

A. In the above situation if `y_(0)=a//2`, the co-ordinates of the point where the ray intersects the upper surface of the slab air boundary are `[a In 2, a/2]`
B. In the above situation if `y_(0)=a//2`, the co-ordinates of the point where the ray intersects the upper surface of the slab air boundary are `[a/2 "In" 2, a/2]`
C. the angle made by light ray with +ve x-axis, at the upper surface of slab air boundary, inside the medium is `pi//3`
D. the angle made by light ray with +ve x-axis, at the upper surface of slab air, boundary, inside the medium is `tan^(-1)(1/2)`

Answer

D