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  4. Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60° ). In the position of minimum deviation, the angle of refraction will be

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Q. Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is $60^{\circ}$ ). In the position of minimum deviation, the angle of refraction will be

JEE AdvancedJEE Advanced 2008

Solution:

At minimum deviation for any wavelength
$r _{1}= r _{2}= A / 2,$
Because $r _{1}+ r _{2}= A$