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Two prisms placed in contact as shown in...

Two prisms placed in contact as shown in figure. The condition for net angular dispersion is zero, is (where `mu_f` and `mu_v` refractive indices of red and voilet light in crown glass respectively and `mu_f' and `mu_v' are refractive indices of red and voilet light in flint glass respectively).

A

`A/A^' ={(mu_f +mu_v) / (mu_v^' + mu_f')}`

B

`A^'/A ={(mu_v - mu_f) / (mu_v^' - mu_f')}`

C

`A^'/A ={-mu_v / (mu_v^' - mu_f')}`

D

`A^'/A ={-(mu_v + mu_f) / (mu_v^' - mu_f')}`

Text Solution

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The correct Answer is:
B
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