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Geometrical Optics question

2004 · Q118
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Geometrical Optics question

2004 · Q118

NEETPhysicsGeometrical OpticsMCQ+4 / −1
The refractive index of the material of a prism is 2\sqrt 22​ and its refracting angle is 30o. One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face with retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is
  1. A
    45o
  2. B
    60o
  3. C
    0
  4. D
    30o
View written solutionFree

Correct answer: A

AIPMT 2004 Physics - Geometrical Optics Question 42 English Explanation


Using law of triangle, we get $\angle r$ = 30o

$\mu $ = $${{\sin i} \over {\sin r}}$$

$ \Rightarrow $ $$\sqrt 2 \times \sin 30^\circ $$ = sini

$ \Rightarrow $ sini = ${1 \over {\sqrt 2 }}$

$ \Rightarrow $ i = 45o
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