A screen is at a distance D 80 cm from a diaphragm having two narrow slits S and S which are d 2 mm apart Slit S is covered by a

Question

A screen is at a distance D 80 cm from a diaphragm having two narrow slits S and S which are d 2 mm apart Slit S is covered by a transparent sheet of thickness 1 2 5 m and slit S is covered by another sheet of thickness 1 25 m as shown in figure S S C Both sheets are made of same material having refractive index 1 40 Water is filled in the space between diaphragm and screen A monodichromatic light beam of wavelength 5000 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 u 4 3

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