Explain with an activity the converging action of concave mirror and help to find focal
length of concave mirror.
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If the image formed is real, inverted and very small in size, then the parallel rays of light meet the point in the front of the mirror. The image formed by the convex lens is real and can be obtained on the screen. f is used to denote the difference between the principal axis P and the focus F of the concave mirror.
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