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The relation between angle of incidence ...

The relation between angle of incidence `i`, angle of prism `A` and angle of minimum deviation for a triangular prism is.

A

`A + delta_m = i`

B

`A + delta_m = 2i `

C

`A + delta_m//2 = i`

D

`2A + delta_m = i`

Text Solution

Verified by Experts

The correct Answer is:
B
For refraction through prism,
`i_1 + i_2 = delta + A and r_1 + r_2 = A`
For minimum deviation,
`i_1 = i_2 = i` and `r_1 = r_2 = r`
So `2i = (A + delta_m)//2`
`therefore A + delta_m = 2i`
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