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 \_\_\_\_ . [21 Jan 2026 Shift 2]

Wave Optics Part 2

Section: Physics

Question : 9 of 64

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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 20µm 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 ‌

, where α is ____ .

[21 Jan 2026 Shift 2]

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