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At what distance from a concave mirror of focal length 10cm should an object is placed if the image is formed at a distance of 20 cm from the mirror

Answer»

20cmexplanation , here ,f=10cm v=20cmaccording to Mirror FORMULA , 1/v+1/u=1/fputting this VALUE , we get , 1/20+1/u=1/10 1/u=1/10-1/20 =2-1/20 =1/20 u=20cmif an OBJECT is PLACED at a DISTANCE of 20cm from the mirror then image distance will be 20cm.



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