1.

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.            \[\sqrt{1-\frac{{{v}^{2}}}{{{c}^{2}}}}\]
Answer» D.            \[\sqrt{1-\frac{{{v}^{2}}}{{{c}^{2}}}}\]


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