In a Young's double slit experiment set up, the two slits are kept 0.4 mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness 20 μ m is introduced in front of one of the slits then center bright fringe shifts by 20 mm on the screen. The refractive index of transparent sheet is given by (α)/10, where α is _ _ _.

Optics: JEE Main 2026 Physics question

JEE Main 2026 · 21 Jan, Evening shift · Q50

JEE Main 202621 Jan, Evening shiftPhysicsHardOptics190× since 2002

In a Young's double slit experiment set up, the two slits are kept 0.4 mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness 20

\mu

m is introduced in front of one of the slits then center bright fringe shifts by 20 mm on the screen. The refractive index of transparent sheet is given by

\frac{\alpha}{10}

, where

\alpha

is ______.

Your answerType your answer. Integers and decimals are accepted.

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