Young's double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit separ…

Question

Young's double slit interference apparatus is immersed in a liquid of refractive index $1.44$ . It has slit separation of $1.5 \, \text{mm}$ . The slits are illuminated by a parallel beam of light whose wavelength in air is $690 \, \text{nm}$ . The fringe-width on a screen placed behind the plane of slits at a distance of $0.72 \, \text{m}$ , will be:

A
$0.33 \, \text{mm}$
B
$0.23 \, \text{mm}$
C
$0.46 \, \text{mm}$
D
$0.63 \, \text{mm}$

Accepted Answer

B. $$0.23 \, 	ext{mm}$$

Answer

A. $$0.33 \, 	ext{mm}$$

Answer

C. $$0.46 \, 	ext{mm}$$

Answer

D. $$0.63 \, 	ext{mm}$$

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