Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are μ r , μ y and μ v respectively and those for the flint glass are 
, 
and 
respectively. Find the ratio 
for which, there is no net angular dispersion.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
For no net angular dispersion
θ Net = θ 1 – θ 2 + θ 3 = 0
θ 2 = θ 1 + θ 3
( μ ' v – μ ' r ) A' = ( μ v – μ r ) A + ( μ v – μ r )A
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