MHT CET202121 Sep 2021Morning ShiftPhysicsWave OpticsActual
A double slit experiment is immersed in water of refractive index 1.33. The slit separations 1 ~mm and the distance between slit and screen is 1.33 ~m . The slits are illuminated by a light of wavelength 6300 Å . The fringe width is
Options
- A4.9 10⁻⁴ ~m
- B6.3 10⁻⁴ ~m
- C8.6 10⁻⁴ ~m
- D5.8 10⁻⁴ ~m
Correct answer
B. 6.3 10⁻⁴ ~m
Step-by-step solution
aligned & d =1 ~mm =10⁻³ ~m , D =1.33 ~m & =6300 Å=6.3 10⁻⁷ ~m aligned _ w = wavelength in water = 6.3 10⁻⁷ 1.33 ~m Fringe width, X = _ w D d = 6.3 10⁻⁷ 1.33 1.33 10⁻³ =6.3 10⁻⁴ ~m