Question

A beam of light consisting of red, green and blue colours is incident on a right-angled prism as shown. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The prism will

• A. seperate part of the red colour from the green and blue colours.
• B. seperate part of the blue colour from the red and green colours.
• C. seperate all the three colours from one another.
• D. not seperate even partially any colour from the other two colours.

Answer 1

The correct option is A seperate part of the red colour from the green and blue colours.

Difference in refractive indices of blue and green colour are less so they are seen together and red is seen separate because deviation depends on refractive index.