Question

The figure shows a mixture of blue, green and red colour ray incident on the right angled prism. The critical angles of the material of prism for red, green and blue colours are ${46}^{\circ }$, ${44}^{\circ }$ and ${43}^{\circ }$ respectively. The arrangement will separate :

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

Answer 1

The correct option is A red colour from green and blue

Since the critical angle of red is greater than ${45}^{\circ }$ hence it is the only color that will not be totally reflected, hence red is separated from green and blue.