For the given data showing object distance and focal length of three concave mirror .
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1) the size of image = size of object only when object is placed at C. and image can be formed at C if object distance is double of the focal length
so in the 3rd case object dist. 20 = 2*10. therefore ANS is 3.
2) in make up mirror , the focal length is always high just as in first case. so ANS is 1.
Explanation:
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