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An achromatic prism is made by combining...

An achromatic prism is made by combining two prisms `P_(1)(mu_(v)=1.523,mu_(r)=1.515)` and `P_(2)(mu_(v)=1.666,mu_(r)=1.650)` Where `mu` represents the refractive index if the angle of the prism `P_(1)` is `10^(@)` then the angle of the prism P will be

A

`5^(@)`

B

`7.8^(@)`

C

`10.6^(@)`

D

`20^(@)`

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The correct Answer is:
a
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