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

Question

Dr. Abubacker · Accepted Answer

[Solution] No net deviation: $(\mu_1 - 1)A_1 = (\mu_2 - 1)A_2$, so $0.42 	imes 10 = 0.7A_2$ and $A_2 = 6^\circ$. Answer (2).

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

Explanation

Reviewed by Dr. Abubacker

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