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Geometrical Optics question

2014 · Q130
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Geometrical Optics question

2014 · Q130

NEETPhysicsGeometrical OpticsMCQ+4 / −1
The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2 A on the first surface returns back through the same path after suffering reflection at the silvered surface.

The refractive index μ\muμ, of the prism is
  1. A
    2sinA
  2. B
    2cosA
  3. C
    12{1 \over 2}21​cosA
  4. D
    tanA
View written solutionFree

Correct answer: B

AIPMT 2014 Physics - Geometrical Optics Question 65 English Explanation


Applying Snell’s law at surface PQ,

1sini = $\mu $sinr

$\mu $ = $${{\sin i} \over {\sin r}}$$ = $${{\sin 2A} \over {{\mathop{\rm sinA}\nolimits} }}$$ = 2cosA
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