JEE Main 2019 — Electromagnetic Waves Question with Solution
JEE Main 2019 (11 Jan Shift 1)
Question
An electromagnetic wave of intensity 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 :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
The speed of electromagnetic wave in free space is given by
In medium, (ii)
Dividing equation (i) by(ii), we get
intensity
similarly
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This is a previous-year question from JEE Main 2019, covering the Electromagnetic Waves chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.