In a convex lens of focal length F , the minimum distance between an object and its real image must be

Step-by-step solution

Let L is the distance between a real object and its real image formed by a convex lens, then as L=(|u|+|v|)=( u - v )^2+2 u v L will be minimum, when ( u - v )^2=0 i.e., u=v Putting, u=-u and v=+u in lens formula, (0 v - @ u = @) F (0 u - ® -u = ๑) F u=2 F (L)_ =2 2- 2 =4(U sing ( i ))