For small angled prisms, (whose refracti...

For small angled prisms, (whose refracting angle (A) is less than 5"), the correct relation between refractive index (`mu`) of material of prism and angle of deviation is

A

`delta = A(mu - 1)`

B

`delta =mu4`

C

`delta = A(mu + 1)`

D

` delta= A(mu^2 -1)`

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The correct Answer is:

A

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