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

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

KCETKCET 2010Ray Optics and Optical Instruments

Solution:

Here, Angle of prism, $A=60^{\circ}$
For minimum deviation, $A=2 r$
or $r=\frac{A}{2}=\frac{60^{\circ}}{2}=30^{\circ}$ for both colours.