MHT CET 2026 Physics question
A double slit experiment is immersed in water of refractive index 1.33. The slit separation is 1 mm, distance between slit and screen is 1.33 m. The slits are illuminated by light of wavelength 6300 . The fringe width is
Answer: (B)
Solution
The wavelength 6300 Å is that of the light in air; in water it becomes m. Fringe width \dfrac{λ' D}{d}\dfrac{6300× 10^{-10}}{1.33}\dfrac{1.33}{1× 10^{-3}}$ =
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