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QNEET-2020-Ph-714: NEET 2020 Physics - Class 12 NEET-2020-Ph-714 Solution: A ray is incident at an angle of incidence i on one surface of…

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is

\mu

then the angle of incidence is nearly equal to:

\mu A

\mu A/2

2\mu A

A/2\mu

Multiple Choice Options

A ${{2A} \over \mu }$ _ 2 A _
B $\mu$ _ A
C ${{\mu A} \over 2}$ 2 _ A _
D ${A \over {2\mu }}$ 2 _ A _

Step-by-Step Verified Solution

Since the light emerges normally from the other surface, the angle of, emergence e = 0 For the triangular prism, we know r 1 + r 2 = A But, e = r 2 = 0 So, r 1 = A For surface 1, Snell's Law is sin _ i = _ . sin _ r 1 sin _ i = _ . sin _ A For small angles _ = sin _ So, i = _ .A

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