Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material of the prism for red, green and blue are `46^@`, `44^@` and `43^@` respectively. The arrangement will separate

Options

A. green colour from red and blue
B. all the three colours
C. red colour from blue and green
D. blue colour from red and green

Answer

C

Explanation

The angle of incidence for B,G and R is `45^(@)` For blue and green , the angle of incidence is greater than the critical angle . Blue nad green will be reflected by total internal reflection Red will be refracted B and G will not be separated but they are separated from red which is refracted.