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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 and respectively. The prism will:
image

  1. A
    Separate the red colour part from the green and blue colours
  2. B
    Separate the blue colour part from the red and green colours
  3. C
    Separate all the three colours from one another
  4. D
    Not separate the three colours at all

Solution & Step-by-step Explanation

image
For a prism, the angle of incidence on the second face is .Total Internal Reflection (TIR) occurs if .Red (): , so it will undergo refraction and exit the prism.Green (): , so it will undergo TIR.Blue (): , so it will undergo TIR.The prism separates Red from Green and Blue.

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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 and respectively. The prism will:
image
A
Separate the red colour part from the green and blue colours
B
Separate the blue colour part from the red and green colours
C
Separate all the three colours from one another
D
Not separate the three colours at all

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