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Q.

A thin symmetric convex lens of focal length 10cm is very close to convex mirror of radius of curvature 20cm and their principal axis are coinciding. A point object is placed at a distance of 20cm from that system as shown in figure
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The final image is formed at a distance is 120xcm  from that system the value of x is
 

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answer is 6.

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Detailed Solution

The refracted rays incident on the convex mirror at it’s centre of curvature, hence final image is formed at the location of the object.

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