Physics · 2021
JEE Main · 25 July 2021, Shift 1 · Q10
A linearly polarized electromagnetic wave in vacuum is E =3.1 cos [(1.8) z-(5.4 × 10^6) t] i N / C is incident normally on a perfectly reflecting…
A linearly polarized electromagnetic wave in vacuum is
$$\mathrm{E}=3.1 \cos \left[(1.8) z-\left(5.4 \times 10^6\right) t\right] \hat{i} \mathrm{~N} / \mathrm{C}
$$
is incident normally on a perfectly reflecting wall at $\displaystyle z=a$. Choose the correct option
Official answer
(2)
The reflected wave will be $\displaystyle 3.1 \cos \left[(1.8) z+\left(5.4 \times 10^6\right) t\right] \hat{i} \mathrm{~N} / \mathrm{C}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.