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Question

# 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 red, green and blue colours are 1.39, 1.44 and 1.47 respectively. The prism will

A
separate the red colour from the green and blue colours
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B
separate the blue colour from the red and green colours
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C
separate all the three colours from one another
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D
not separate the three colours at all
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Solution

## The correct option is A separate the red colour from the green and blue coloursμ=1sin ic=1sin 45°=√2=1.414μred=1.39<μμblue>μμgreen>μ Since μ of green and violet are greater than 1.414 so they will suffer total internal reflection. Only red colour does not suffer total internal reflection

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