Test Index

IIT JEE Advanced 2007 Paper 2

Paragraph for Questions 17–19:

The figure shows a surface XY separating two transparent media, medium-1 and medium-2. The lines ab and cd represent wave fronts of a light wave traveling in medium-1 and incident on XY. The lines ef and gh represent wave fronts of the light wave in medium-2 after refraction.

Section: Physics

Question : 19 of 66

Marks: +1, -0

Speed of light is

[JEE Adv 2007 P2]

the same in medium-1 and medium-2.
larger in medium-1 than in medium-2.
larger in medium-2 than in medium-1.
different at b and d.

Validate

Solution:

Incident and refracted rays are normal to their respective wavefronts, as shown in the figure:

We know that

v_{\text{relative}}

v_1 - v_2

That is,

\frac{v_1}{v_2}

\frac{\sin r}{\sin i}

and ∠i > ∠r ⇒

v_1

v_2

Since ∠r < ∠i, medium 2 is denser than medium 1. Therefore,

v_2

v_1

Go to Question:

Prev Question

Next Question