An observer moves with a velocity v towards a source. If actual velocity of light from source is c, its velocity relative to the observer is

\sqrt{1 - v^{2} / c^{2}}

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c

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c - v

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c + v

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Solution

The correct option is B $c$
Consider two particles with velocity u and w. The expression for the relative velocity can be given by
$v = \frac{w - u}{1 - \frac{w u}{c^{2}}}$ .
If one of the particle is light, $w = c$ .
This gives relative velocity of light $v = c$ .
Relative velocity of light in vacuum is always constant.
Ans: B

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An observer moves with a velocity v towards a source. If actual velocity of light from source is c, its velocity relative to the observer is

The correct option is B cConsider two particles with velocity u and w. The expression for the relative velocity can be given byv=w−u1−wuc2.If one of the particle is light, w=c.This gives relative velocity of light v=c.Relative velocity of light in vacuum is always constant.Ans: B