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A point source S is placed at a distance...

A point source S is placed at a distance of 15 cm from a converging lens of focal length 10 cm on its principal axis. Where should a diverging miror of focal length 12 cm be placed to that a real image is formed on the source itself.

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`u=-15` cm ,`f=+10"cm" ,(1)/(v) - (1)/(u)= (1)/(f) implies (1)/(v)- (1)/((-15)) = (1)/(10) implies v =30 "cm"`
(i)`x= v +2f implies 30 + 3 xx 12 = 54 "cm" (ii) x=v-2f = 30-2xx 12 = 6"cm"`
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