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An object is placed at a distance of 15 cm from a concave mirror and its real image is formed at 30 cm in front of that mirror. The focal length of the mirror is |
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Answer» `+ 20` CM `(1)/(f) = (1)/(v) + (1)/(u) = (1)/((-15)) + (1)/((-30)) = (-2-1)/(30) = - (1)/(10) rArr f = - 10` cm |
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