In Young double slit experiment central and 10th maxima y-co-ordinate are 2 cm and 5 cm respectively when young double slit experiment appratus is immersed in liquid of refractive index 1.5.
(i) Find the width of fringe in liquid –
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Ans.
(i)
Sol . Distance between central maxima and 10 th maxima = 5 cm – 2 cm = 3 cm
Width of fringe is β in air
10 β = 3 cm
β = 0.3 cm = 3 mm
Width of fringe in liquid
β′ = 
= 
= 2 mm
(ii)
Sol. No change the location of central maxima in side liquid due to this, y-co-ordinate of central maxima remain same = 2 cm
Location of 10 th maxima = 10 β ′ = 10 × 2 mm
= 20 mm = 2 cm
So y-co-ordinate of 10 th maxima in liquid
= 2 cm + 2 cm = 4 cm
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