question_answer

The velocity of light emitted by a source S observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be                                              [NCERT 1980]

A)            c + v                                         

B)            \[c-v\]

C)            c     

D)            \[\sqrt{1-\frac{{{v}^{2}}}{{{c}^{2}}}}\]