A plane light wave falls normally on a diaphragm with round aperture opening the first N Fresnel zones for a point P on a screen located at a distance b from the diaphragm The wavelength of light is equal to Find the intensity of light Io in front of the diaphragm if the distribution of intensity of light I (r) on the screen is known Here r is the distance from the point P

Question: A plane light wave falls normally on a diaphragm with round aperture opening the first N Fresnel zones for a point P on a screen

A plane light wave falls normally on a diaphragm with round aperture opening the first N Fresnel zones for a point P on a screen located at a distance b from the diaphragm. The wavelength of light is equal to λ. Find the intensity of light Io in front of the diaphragm if the of intensity of light I (r) on the screen is known. Here r is the distance from the point P.

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