In a 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 without disturbing the geometrical arrangement, the new fringe width will be

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0.30 mm

0.40 mm

0.53 mm

450 micron

answer is A.

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Detailed Solution

β=λDd; ∴B∝λ λ'λ=0.44/3⇒λ'=0.3 mm

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