The light from a point source incident on the diaphragm

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The light from a point source incident on the diaphragm with a circular hole whose radius can be changed arbitrarily. The screen is located at a distance l1 = 1,25 m from the diaphragm, turned diffraction pattern. Find the length of the incident light, when the center of the diffraction pattern is observed for a maximum of r1 = 1,00 mm, and following it - when r2 = 1,29 mm. The distance from the source to the aperture l2 = 1 m.

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Task 40956. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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