JEE Main 2026 — Wave Optics Question with Solution
JEE Main 2026 (21 January Shift 1)
Question
In a double slit experiment the distance between the slits is 0.1 cm and the screen is placed at 50 cm from the slits plane. When one slit is covered with a transparent sheet having thickness and refractive index , the central fringe shifts by 0.2 cm. The value of is cm.
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
Given: cm, cm, , Shift cm
Optical path difference by sheet:
Shift of central fringe: Shift
cm
Optical path difference by sheet:
Shift of central fringe: Shift
cm
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This is a previous-year question from JEE Main 2026, covering the Wave Optics 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.