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From Lens maker.s formula, <br> In `1/f=(mu-1)[(1)/(R_1)-(1)/(R_2)],R_1=infty,R_2=-30` cm <br> `therefore 1/f=(1.5-1.0)[(1)/(infty)-(1)/(-30)]` <br> `therefore 1/f=0.5 xx(1)/(30)=(1)/(60)` <br> `therefore` f=60 cm