A plane electromagnetic wave of frequency \( w_{0} \) falls normally on the surface of a mirror ...

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A plane electromagnetic wave of frequency \( w_{0} \) falls normally on the surface of a mirror approaching with a relativistic velocity \( v \). Then frequency of the reflected wave will \( \operatorname{be}\left(\operatorname{given} \beta=\frac{v}{c}\right) \)
(a) \( \left(\frac{1-\beta}{1+\beta}\right) w_{0} \)
(b) \( \frac{1+\beta}{(1-\beta) w_{0}} \)
(c) \( \frac{(1+\beta) w_{0}}{(1-\beta)} \)
(d) \( \frac{(1-\beta)}{(1+\beta) w_{0}} \)
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