c = 3 × 10⁸ m/s.
CUET UG 2022 — Physics Optics
The speed of light in vacuum is
Verified 30 May 2026.
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The refractive index of glass with respect to air is 1.5. What is the critical angle for total internal reflection?
In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3, the new fringe width will be:
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