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Geometrical Optics question

2012 · Q140
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Geometrical Optics question

2012 · Q140

NEETPhysicsGeometrical OpticsMCQ+4 / −1
A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small ) and emerges normally from the opposite face. If the refractive index of the prism is μ\muμ. the angle of incidence i, is nearly equal to
  1. A
    μ\muμA
  2. B
    μA2{{\mu A} \over 2}2μA​
  3. C
    Aμ{A \over \mu }μA​
  4. D
    A2μ{A \over {2\mu }}2μA​
View written solutionFree

Correct answer: A

For normally emerge e = 0

Therefore r2 = 0 and r1 = A

Snell’s Law for Incident ray’s

1sin i = μ\mu μ sin r1 = μ\mu μsin A

For small angle

i = μ\mu μA

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