In Young’s experiment, the upper slit is covered by a thin glass plate of refractive index 1.4, while the lower slit is covered by another glass plate having the same thickness as the first one but having the refractive index 1.7. Interference pattern is observed using light of wavelength 5400 Å . It is found that the point P on the screen where central maximum (n = 0) fall before the glass plate were inserted, now has % the original intensity. It is further observed that what used to be the fifth maximum earlier lies below the point P while the sixth minima lies above P. Calculate the thickness of glass plate. (Absorption of light by glass plate may be neglected).

In Young’s experiment, the upper slit is covered by a thin glass pla

1.	In Young’s experiment, the upper slit is covered by a thin glass plate of refractive index 1.4, while the lower slit is covered by another glass plate having the same thickness as the first one but having the refractive index 1.7. Interference pattern is observed using light of wavelength 5400 Å . It is found that the point P on the screen where central maximum (n = 0) fall before the glass plate were inserted, now has % the original intensity. It is further observed that what used to be the fifth maximum earlier lies below the point P while the sixth minima lies above P. Calculate the thickness of glass plate. (Absorption of light by glass plate may be neglected).
Answer» ANSWER :9.3`MU` m

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