A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of surface of a plano-convex lens made of the same material with power 1.5 P is :
Option: 1 2R
 
Option: 2 \frac{R}{2}
Option: 3 \frac{3R}{2}  
Option: 4 \frac{R}{3}

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