JEE PYQ: Electromagnetic Waves Question 38
Question 38 - 2019 (11 Jan 2019 Shift 1)
An electromagnetic wave of intensity 50 Wm$^{-2}$ enters in a medium of refractive index ’n’ without any loss. The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively, given by:
(1) $\left(\frac{1}{\sqrt{n}}, \frac{1}{\sqrt{n}}\right)$
(2) $(\sqrt{n}, \sqrt{n})$
(3) $(\sqrt{n}, \frac{1}{\sqrt{n}})$
(4) $\left(\frac{1}{\sqrt{n}}, \sqrt{n}\right)$
Show Answer
Answer: (3)
Solution
$\frac{E_1}{E_2} = \sqrt{n}$ and $\frac{B_1}{B_2} = \frac{1}{\sqrt{n}}$.
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