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Find the focal length (D) of a concave mirror with R - 20 c.m..
Write the benefits you observe, if the plaster of paris was not invented.
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the focal length of the concave mirror is 10 because the relationship between focal length and radius of curvature is f is equals to 1 by 2 16 year f is equals to minus 20 by 20 the focal length is 10 according to sign convention it is minus 10 centimetres
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