Two coherent sources are 0.15 mm apart and fringes are observed at 1 m away with monochromatic light of wavelength 6000Å.Find (a) the fringe width in air, (b) the fringe width in a liquid of refractive index 5/2.

Two coherent sources are 0.15 mm apart and fringes are observed at 1 m

1.	Two coherent sources are 0.15 mm apart and fringes are observed at 1 m away with monochromatic light of wavelength 6000Å.Find (a) the fringe width in air, (b) the fringe width in a liquid of refractive index 5/2.
Answer» Solution :(a) Fringe width `beta = (lamda D)/(d) = (6000 XX 10^(-10) xx 1)/(0.15 xx 10^(-3)) , i.e., beta = 4mm` (B) Fringe width in a medium `beta = beta/mu = (4)/(5//2) = 1.6mm`

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Two coherent sources are 0.15 mm apart and fringes are observed at 1 m away with monochromatic light of wavelength 6000Å.Find (a) the fringe width in air, (b) the fringe width in a liquid of refractive index 5/2.

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