Q.

In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be

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a

0.2 mm

b

0.3 mm

c

0.4 mm

d

1.2 mm

answer is C.

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Detailed Solution

βmadium =βair μ=0.61.5=0.4mm
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In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be