Q.

Statement 1: If the whole apparatus of Young's experiment is immersed in liquid, the fringe width will decrease.Statement 2: The wavelength of light in water in more that of air.

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a

Both statements 1 and 2 are correct

b

Statement 1 is correct statement 2 is incorrect

c

Statement 1 is incorrect statement 2 is correct

d

Both statements 1 and 2 are incorrect

answer is B.

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Detailed Solution

When whole of the apparatus is immersed in water, then wavelength of light decreases form the relation λ′=λ/μ,μ being refractive index of water.Therefore, fringe width β=Dλd or β∝λ will decrease as λ decreases when immersed in water. Also we conclude that wavelength of light in water is less than that in air.
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