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A beam of light consisting of red, green and blue colours is incident on a right angled prism, fig. The refractive indices 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

separate some part of blue colour from red and green colours

B

separate all the three colours from other two colours

C

no separate any colours from other two colours

D

separate some part of red colour from green and blue colours

Text Solution

Verified by Experts

The correct Answer is:
4
`n=(1)/(sin i_(c))=(1)/(sin45^(@)) =1.4142`
As`mu_(g)`and`mu_(b)`are 1.44and1.47 respectively are more than `mu=1.41142`hence the green and blue colours will undergo total internal refelection.for colour `ilti_(c)`hence this colour will get refracted in air.
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