Task id16617

Task id16617

The screen is illuminated by a light source located at the focus of a lens having an optical power of D = 0.5 diopters. The lens is located between the light source and the screen (Fig.). Find the illumination in the center of the screen if the luminous intensity of the source is l = 100 cd. Neglect the absorption of light in the lens.

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Detailed solution. Format gif