An object is placed at a distance of 40cm from a concave mirror of focal length 15cm. If the object is displaced through a distance of 20cm towards the mirror, the displacement of the image will be

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30cm away from the mirror

36cm away from the mirror

36cm towards the mirror

30cm towards the mirror

answer is B.

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Detailed Solution

⇒v1=u1fu1-f=40(15)40-15=24 cm→1 ⇒v2=u2fu2-f=60(15)60-15=60 cm→2 ∆v=v2-v1=60-24=36 cmaway from the mirror

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