A young's double slit apparatus is immersed in a liquid of refractive index 1.33.It has slit separation of 1 mm and interference pattern is observed on the screen at a distance 1.33 m from plane of slits. The wavelength in air is `6300 Å`
Calculate the fringe width.

Options

A. 0.63 mm
B. 1.26mm
C. 1.67mm
D. 2.2mm

Answer

A

Explanation

`lambda = lambda_0/mu, omega = (lambdaD)/d = (lambda_0D)/(mud)`
`=((6300 xx 10^(-10))(1.33))/(1.33 xx 10^(-3))`
` = 0.63 xx 10^(-3)m `
` =0.63 mm` .