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NEET 2012
Exam
NEET
Year
2012
Subject
Physics
Chapter
Ray Optics

NEET 2012 · Physics · Ray Optics

A ray of light is incident at an angle of incidence, i , on one...

A ray of light is incident at an angle of incidence, ii, on one face of a prism of angle AA (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is μ\mu, the angle of incidence ii, is nearly equal toA 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

Options

  1. AμA\mu A
  2. BμA2\frac{\mu A}{2}
  3. CA/μA / \mu
  4. DA/2μA / 2 \mu

Correct answer

A. μA\mu A

Step-by-step solution

Refractive index μ=sin⁡isin⁡rμ=sin⁡isin⁡A\begin{gathered} \mu=\frac{\sin i}{\sin r} \\ \mu=\frac{\sin i}{\sin A} \end{gathered} In case of small angle. μ=iAi=μA\begin{aligned} \mu & =\frac{i}{A} \\ i & =\mu A \end{aligned} 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
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