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JIPMER 2019
Exam
JIPMER
Year
2019
Subject
Physics
Chapter
Ray Optics

JIPMER 2019 · Physics · Ray Optics

When a light ray enters from oil to glass on oil- glass interface,...

When a light ray enters from oil to glass on oil- glass interface, then velocity of light changes by a factor of [given, μoil =2,μglass =3/2\mu_{\text{oil }}=2, \mu_{\text{glass }}=3 / 2 ]

Options

  1. A43\frac{4}{3}
  2. B34\frac{3}{4}
  3. C3
  4. D1

Correct answer

A. 43\frac{4}{3}

Step-by-step solution

Given, μoil =2\mu_{\text{oil }}=2 and μglass =3/2\mu_{\text{glass }}=3 / 2 velocity of light in oil is given by Voil = Velocity of light (c) μoil =cμoil  Similarly, Vglass =cμglass ∴Vglass Voil =c/μglass c/μoil =μoil μglass =23/2=43\begin{aligned} & \mathrm{V}_{\text{oil }}=\frac{\text{ Velocity of light (c) }}{\mu_{\text{oil }}}=\frac{\mathrm{c}}{\mu_{\text{oil }}} \\ \text{ Similarly, } \mathrm{V}_{\text{glass }} & =\frac{\mathrm{c}}{\mu_{\text{glass }}} \\ \therefore \quad & \frac{V_{\text{glass }}}{\mathrm{V}_{\text{oil }}}=\frac{\mathrm{c} / \mu_{\text{glass }}}{\mathrm{c} / \mu_{\text{oil }}}=\frac{\mu_{\text{oil }}}{\mu_{\text{glass }}}=\frac{2}{3 / 2}=\frac{4}{3} \end{aligned}
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