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NEET 2010
Exam
NEET
Year
2010
Subject
Physics
Chapter
Ray Optics

NEET 2010 · Physics · Ray Optics

A ray of light is incident on a 60^ prism at the minimum deviation...

A ray of light is incident on a 60∘60^{\circ} prism at the minimum deviation position. The angle of refraction at the first face (ie, incident face) of the prism is

Options

  1. Azero
  2. B30∘30^{\circ}
  3. C45∘45^{\circ}
  4. D60∘60^{\circ}

Correct answer

B. 30∘30^{\circ}

Step-by-step solution

The refracting angle of prism A=r_1+r2Forminimumdeviation\mathrm{r}_2 For minimum deviationr1=r2=r∴A=2ror r=A2=60∘2=30∘\begin{array}{l} \mathrm{r}_1 =\mathrm{r}_2=\mathrm{r} \\ \therefore \mathrm{A} =2 \mathrm{r} \\ \text{or } \mathrm{r} =\frac{\mathrm{A}}{2}=\frac{60^{\circ}}{2}=30^{\circ} \end{array}$$
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