Optics 4 Question 8

8. 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

(a) 30 for both the colours

(b) greater for the violet colour

(2008, 3M)

(c) greater for the red colour

(d) equal but not 30 for both the colours

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Solution:

  1. At minimum deviation (δ=δm) :

r1=r2=A2=602=30 (For both colours) 



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