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JIPMER 2013
Exam
JIPMER
Year
2013
Subject
Physics
Chapter
Ray Optics

JIPMER 2013 · Physics · Ray Optics

A point source of light is placed 4 m below the surface of water of...

A point source of light is placed 4 m below the surface of water of refractive index 5/35 / 3. The minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is

Options

  1. A6 m
  2. B3 m
  3. C4 m
  4. D2 m

Correct answer

A. 6 m

Step-by-step solution

Given, sin⁡i=1μ=35\sin i=\frac{1}{\mu}=\frac{3}{5} So, tan⁡i=34=r4\quad \tan i=\frac{3}{4}=\frac{r}{4} It gives r=3 m\quad r=3 \mathrm{~m} So, the diameter =6 m=6 \mathrm{~m}.
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