A screen is at distance `D = 80` cm form a diaphragm having two narrow slits `S_(1)` and `S_(2)` which are `d = 2` mm apart. Slit `S_(1)` is covered by a transparent sheet of thickness `t_(1) = 2.5 mu m` slit `S_(2)` is covered by another sheet of thikness `t_(2) = 1.25 mu m` as shown if Fig. 2.52. Both sheets are made of same material having refractive index `mu = 1.40` Water is filled in the space between diaphragm and screen. Amondichromatic light beam of wavelength `lambda = 5000 Å` is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity of C to maximum intensity of interference pattern obtained on the screen `(mu_(w) = 4//3)`

A screen is at distance `D = 80` cm form a diaphragm having two narrow

1.	A screen is at distance `D = 80` cm form a diaphragm having two narrow slits `S_(1)` and `S_(2)` which are `d = 2` mm apart. Slit `S_(1)` is covered by a transparent sheet of thickness `t_(1) = 2.5 mu m` slit `S_(2)` is covered by another sheet of thikness `t_(2) = 1.25 mu m` as shown if Fig. 2.52. Both sheets are made of same material having refractive index `mu = 1.40` Water is filled in the space between diaphragm and screen. Amondichromatic light beam of wavelength `lambda = 5000 Å` is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity of C to maximum intensity of interference pattern obtained on the screen `(mu_(w) = 4//3)`
Answer» Correct Answer - `[(3)/(4)]`

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