A candle flame 3 cm is placed at distance of 3 m from a wall. How far from wall must a concave mirror be placed in order that it may form an image of flame 9 cm high on the wall
A
225 cm
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B
300 cm
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C
450 cm
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D
650 cm
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Solution
The correct option is C 450 cm Let the mirror be placed at a distance x from wall
By using IO=−vu⇒−9+3=−(−x)(x−3)⇒x=−4.5m=−450cm.