In a Young's double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be
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a
0.20 mm
b
0.401 mm
c
0.242 mm
d
0.165 mm
answer is A.
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Detailed Solution
β=λDd; If λ and d both increase by 10%, there will be no change in fringe width (β).
In a Young's double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be