Speed of light is [2007]

Question

The figure shows a surface XY separating two transparent media, medium-1 and medium-2. The lines ab and cd represent wavefronts of a light wave travelling in medium-1 and incident on XY. The lines ef and gh represent wavefronts of the light wave in medium-2 after refraction. [2007]

Q. Speed of light is

Smart Achievers · Accepted Answer

(2)

From the figure, the gap between consecutive wavefronts in medium 2 is less than that in medium 1. Hence, the wavelength of light in medium 2 is less than that in medium 1. Therefore, the speed of light $(v = f λ)$ in medium 1 is greater than that in medium 2.

Solution

1 the same in medium-1 and medium-2

2 larger in medium-1 than in medium-2

3 larger in medium-2 than in medium-1

4 different at $b$ and $d$ .

Ans.
(2)

From the figure, the gap between consecutive wavefronts in medium 2 is less than that in medium 1. Hence, the wavelength of light in medium 2 is less than that in medium 1. Therefore, the speed of light $(v = f λ)$ in medium 1 is greater than that in medium 2.

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