Question

An observer is approaching with velocity $\upsilon$ towards a light source. If the velocity of light is c, then velocity of light with respect to observer will be

• A. $c-v$
• B. $c$
• C. $c+v$
• D. $\sqrt{1-v^2/c^2}$

Answer 1

The correct option is B $c$

The velocity of light is a universal constant, and hence it is same for both stationary and any moving observer. However both frequency and wavelength of observed light may change for different moving observers, keeping the speed of light constant.

Hence correct answer is option B.