Question 311: Ray Optics

Question

A thin prism having refracting angle 10
o
is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting angle of second prism should be

Accepted Answer

The condition for dispersion without deviation is given as
|($$\mu $$ Ã¢ÂÂ 1)|A = |($$\mu $$' Ã¢ÂÂ 1)| A'
$$ \Rightarrow $$ (1.42 Ã¢ÂÂ 1) ÃÂ 10
o
= (1.7 Ã¢ÂÂ 1)A'
$$ \Rightarrow $$ 4.2 = 0.7A' or A' = 6
o

Answer

6
o

Answer

8
o

Answer

10
o

Answer

4
o

Ray Optics

A thin prism having refracting angle 10 o is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting angle of second prism should be

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