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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:

1. C and D only
2. B and D only
3. B and C only
4. A and C only

Correct answer: C and D only

Solution

Option C is correct because the speed of light in a vacuum remains constant regardless of the motion of the source, as established by the theory of relativity. Option D is also correct because the speed of light in a medium does not change with the intensity of the light; it is determined by the medium's properties.

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