Ray Optics and Optical Instruments - Result Question 58

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61. A ray of light is incident at an angle of incidence, $i$, on one face of prism of angle $A$ (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $\mu$, the angle of incidence $i$, is nearly equal to: [2012]

======= ####61. A ray of light is incident at an angle of incidence, $i$, on one face of prism of angle $A$ (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $\mu$, the angle of incidence $i$, is nearly equal to: [2012]

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/ray-optics-and-optical-instruments/ray-optics-and-optical-instruments—result-question-58.md (a) $\mu A$

(b) $\frac{\mu A}{2}$

(c) $\frac{A}{\mu}$

(d) $\frac{A}{2 \mu}$

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Answer:

Correct Answer: 61. (a)

Solution:

  1. (a) For normally emerge $e=0$

Therefore $r_2=0$ and $r_1=A$

Snell’s Law for incident ray’s

$1 \sin i=\mu \sin r_1=\mu \sin A$

For small angle

$i=\mu A$