Task id16297
Seller: nerdmavr
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Product description
A converging beam of rays passing through a hole of radius r = 5 cm in an opaque screen produces a bright spot of radius R = 4 cm on the screen located behind the screen at a distance b = 20 cm. After a lens was inserted into the hole, the spot turned into a point . Find the focal length F of the lens (Fig.).
Additional information
Detailed solution. Format gif