Created by StemPy LabA torch has a lamp at the focus of a concave mirror. Why is the beam from the torch nearly parallel?
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← A small lamp is fixed at 2.1 m from a plane mirror. A technician slides the mirror 0.55 m farther from the lamp, along the line joining them. By how much does the distance between the lamp and its image change?A concave mirror of focal length 8 cm projects the image of a glowing filament onto a screen. The filament is 24 cm from the mirror. At what position must the screen be put, with its sign in the New Cartesian convention, measured from the pole? →
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