Task id16334
The segment AB is located along a straight line passing through the focus of the collecting lens at an angle a = 60° to its main optical axis. The distances from points A and B to the focus F are equal, respectively: a = 5 cm, b = 10 cm. What is the focal length of the lens F, if it is known that the length of the segment AB is equal to the length of its image (Fig.a).
Detailed solution. Format gif
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