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NEET 2007
Exam
NEET
Year
2007
Subject
Physics
Chapter
Ray Optics

NEET 2007 · Physics · Ray Optics

A small coin is resting on the bottom of a beaker filled with...

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid? A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the

Options

  1. A2.4×108 m/s2.4 \times 10^8 \mathrm{~m} / \mathrm{s}
  2. B3.0×108 m/s3.0 \times 10^8 \mathrm{~m} / \mathrm{s}
  3. C1.2×108 m/s1.2 \times 10^8 \mathrm{~m} / \mathrm{s}
  4. D1.8×108 m/s1.8 \times 10^8 \mathrm{~m} / \mathrm{s}

Correct answer

D. 1.8×108 m/s1.8 \times 10^8 \mathrm{~m} / \mathrm{s}

Step-by-step solution

∵1μ=sin⁡θc=35\because \quad \frac{1}{\mu}=\sin \theta_c=\frac{3}{5}⇒μ=53 And v=cμ=3×1085/3=95×108=1.8×108ms−1\begin{aligned} & \Rightarrow \quad \mu=\frac{5}{3} \\ & \text{ And } v=\frac{c}{\mu}=\frac{3 \times 10^8}{5 / 3} \\ & =\frac{9}{5} \times 10^8=1.8 \times 10^8 \mathrm{ ms}^{-1} \end{aligned}$$
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