Question: Q. 1. A linearly polarized electromagnetic wave given as
(a)
(b)
(c)
(d)
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Solution:
Ans. Correct option : (b)
Explanation: The phase of a wave changes by
It is given that the incident electromagnetic wave is :
Therefore, the reflelected electromagnetic wave is given by
$$ \begin{aligned} \mathrm{E}{r} & =E{0}(-\hat{i}) \cos [k(-z)-\omega t+\pi][\because \hat{z}=-\hat{z} \text { and } \hat{i}=-\hat{i}] \ & =-E_{0} \hat{i} \cos [\pi-(k z+\omega t)] \ & =-E_{0} \hat{i}[-\cos {(k z+\omega t)}] \ & =E_{0} \hat{i} \cos (k z+\omega t) \end{aligned} $$
