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A concave mirror of focal length/produces a real image n times the size of the object. What is the distance of the object from the mirror ? |
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Answer» Solution :As IMAGE is real, it will be inverted one and HENCE magnification `m=-v/U = -n RARR v = mu` So, from mirror formula `1/v + 1/u = 1/f`, we have `1/(mu) + 1/u =1/(-f) rArr (1+n)/(nu) = -1/f rArr u=-((n+1)/n)f` THUS, object is in front of mirror at a distance `((n+1)/n)f` |
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