Question ID - 154122 | SaraNextGen Top Answer
In a modified Young’s double slit experiment, a monochromatic uniform and parallel beam of light of wavelength 
and intensity 
is incident normally on two circular apertures 
and 
of radii 0.001 m and 0.002 m, respectively. A perfectly transparent film of thickness 
and refractive index 1.5 for the wavelength of 
is placed in front of aperture A (see the figure). Calculate the power (in mW) received at the focal spot 
of the lens. The lens is symmetrical placed with respect to the aperture. Assume that 10% of the power received by each aperture goes in the original direction and is brought to the focal spot
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(7) The powers of sources
Powers of sources
Path difference
Phase difference
Power at point
|
and 
are
and 
received along 
are
is given by
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