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NEET 2020
Exam
NEET
Year
2020
Subject
Physics
Chapter
Ray Optics

NEET 2020 · Physics · Ray Optics

A ray is incident at an angle of incidence i on one surface of a...

A ray is incident at an angle of incidence ii on one surface of a small angle prism (with angle of prism AA) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ\mu, then the angle of incidence is nearly equal to:A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A ) and emerges

Options

  1. A2Aμ\dfrac{2A}{\mu}
  2. B\muA\muA
  3. C\muA2\dfrac{\muA}{2}
  4. DA2μ\dfrac{A}{2\mu}

Correct answer

B. \muA\muA

Step-by-step solution

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A ) and emerges

r2=0{r}_{2} = 0

r1=A{r}_{1} = A

Apply Snell's law

sini=μsinr1sini = \mu sin{r}_{1}

for small angle \left({r}_{1} = A\right)</p><p></p><p>i = \muA

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