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Q.

An object is placed at a certain distance on the principal axis of concave mirror. The image is formed at a distance 30 cm from the mirror. Find the object distance if r = 15 cm

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a

15 cm

b

20 cm

c

10 cm

d

7.5 cm

answer is C.

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Detailed Solution

v=30 cm r=15 cm⇒f=-7.5 cm 1/f=1/v+1/u⇒-10/75=1/u-1/30 1/30-10/75=1/u 5-20/150=1/u -15/150=1/u⇒u=-10 cm

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