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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:

Options

  1. ASeparate all the three colours from one another
  2. BNot separate the three colours at all
  3. CSeparate the red colour part from the green and blue colours
  4. DSeparate the blue colour part from the red and green colours

Correct answer

C. Separate the red colour part from the green and blue colours

Step-by-step solution

​ For TIR I > I c so, S i n i > sin ⁡ I c S i n 45 o > 1 μ ⇒ μ 2 ⇒ μ = 1.414 Since μ of green and violet are greater than 1.414 so they will total internal refrected. But red colour will be vetracted.

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