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JIPMER 2005
Exam
JIPMER
Year
2005
Subject
Physics
Chapter
Ray Optics

JIPMER 2005 · Physics · Ray Optics

What should be the minimum value of refractive index of the...

What should be the minimum value of refractive index of the material of the prism for the reflections to take place as shown in the figure? What should be the minimum value of refractive index of the material of the prism for the reflections to take place as

Options

  1. A1.7
  2. B1.4
  3. C1.2
  4. D2.7

Correct answer

B. 1.4

Step-by-step solution

From the formula, the minimum refractive index is μm=sin⁡isin⁡r=sin⁡90∘sin⁡45∘=11/2=2=1.414≈1.4\begin{aligned} \mu_m & =\frac{\sin i}{\sin r}=\frac{\sin 90^{\circ}}{\sin 45^{\circ}} \\ & =\frac{1}{1 / \sqrt{2}}=\sqrt{2}=1.414 \\ & \approx 1.4\end{aligned}
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