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Question

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=vu9+3=(x)(x3)

9(x3)=3x

3x9=x

2x=9

x=4.5m=450cm.


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