JEE Main 2023 — Electromagnetic Waves Question with Solution
From: JEE Main 2023 (Online) 31st January Morning Shift
Question
In a medium the speed of light wave decreases to times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is . The value of is _________.
(Given speed of light in free space and for the given medium )
Enter your answer
Show full solutionCorrect answer: 5
Step-by-step explanation
Putting the values:
Required ratio
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Electromagnetic Waves chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2023, 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.