Correct Answer - 1
`P_(eq)=2P_(l)+P_(m)` ltbr. `P_(l)=(1.5-1)((1)/(oo)-(1)/(-0.3))=(5)/(3)D`
`f_(m)=(R )/(2)=-15cm rArrP_(m)=(-100)/(f_(m))=(20)/(3)D`
`P_(eq)=2xx(5)/(3)+(20)/(3) rArr P_(eq)=10D`
`f_(eq)=-(100)/(P_(eq))=-10cm`
So object should be placed at`2f_(eq)`
`u=-20cm`