A screen is at a distance  cm from a diaphragm having two narrow slits  and  which are  mm apart. Slit  is covered by a transparent sheet of thickness m and  by another sheet of thickness as shown in the figure. Both sheets are made of same material having refractive index . Water is filled in space between diaphragm and screen. A monochromatic light beam of wavelength  is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity of centre of screen to intensity of individual slit,

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A screen is at a distance  cm from a diaphragm having two narrow slits  and  which are  mm apart. Slit  is covered by a transparent sheet of thickness m and  by another sheet of thickness as shown in the figure. Both sheets are made of same material having refractive index . Water is filled in space between diaphragm and screen. A monochromatic light beam of wavelength  is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity of centre of screen to intensity of individual slit,