Geometrical OpticsHard
Question
Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60o). In the position of minimum deviation, the angle of refraction will be
Options
A.30o for both the colours
B.greater for the violet colour
C.greater for the red colour
D.equal but not 30o for both the colours
Solution
At minimum deviation for any wavelength
r1 = r2 = A/2, Because r1 + r2 = A
r1 = r2 = A/2, Because r1 + r2 = A
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