A beam of light consisting of red, green and blue colours is incident on a right-angled prism. 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:

Step-by-step solution

For Total internal reflection, (i > i_ c ) so, ( i > i_c ) ( 45^ > 1 ) ⇒ μ = 2 ⇒ μ = 1.414 Since μ of green and violet is greater than 1 . 414 , so they will undergo total internal reflection. But red colour will be refracted. So the prism will separate red colour from the green and blue colours.