If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.
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Solution
f = -10cm case 1: m=2 (Image is virtual and erect) object is placed 5cm infront of mirror.
Case 2: m=-2 (Image is real and inverted) object is placed 15cm infront of mirror .