Which of the following are true? A. Speed of light in vacuum is… | JEE Main 2023 (29 Jan, Shift 1)

Q8JEE Main 2023 · 29 JAN · SHIFT 1Medium

Speed of EM Waves in a Medium

Which of the following are true?

A. Speed of light in vacuum is dependent on the direction of propagation.

B. Speed of light in a medium is independent of the wavelength of light.

C. The speed of light is independent of the motion of the source.

D. The speed of light in a medium is independent of intensity.

Choose the correct answer from the options given below:

Show answer and solution

Answer: (d)

A: false, speed of light in vacuum is the same in every direction.
B: false, in a medium $n$ depends on $\lambda$ (dispersion), so speed depends on wavelength.
C: true, speed of light does not depend on motion of the source.
D: true, speed in a medium does not depend on intensity.
So the answer is (d) C and D only.

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