Task id13686
A lens with a focal length F = 50 cm and a diameter D = 5 cm is illuminated by a parallel monochromatic beam of light with a wavelength l = 630 nm. Find how many times the intensity of wave I at the focus of the lens exceeds the intensity of wave I0 incident on the lens. Estimate the size b of the spot in the focal plane.
Answer. Format gif
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