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+clear
+//Given
+f1=20.0 //cm
+f2=-40.0 //cm
+
+//Calculation
+f=1/((1/f1)+(1/f2))
+P=1/f
+
+//Result
+printf("\n Focal length is %0.3f cm", f)
+printf("\n Power is %0.3f D",P*10**2)