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The minimum distance between the object and its real image formed by a convex lens of focal length f is a) 1.5 f b) f c) 4 f d) 3 f

The minimum distance between the object and its real image formed by a convex lens of focal length f is
a) 1.5 f b) f c) 4 f d) 3 f

Grade:upto college level

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
2 years ago
576-510_5.PNG
Arun
25763 Points
2 years ago
Let the distance between the object and its real image formed by convex lens be d1.
Let the distance of the object from lens be x,so,the image distance from the lens is (d-x).
Then,   x=2d±d24fd
 For real values of x,
 d24fd
 that is ,d4f
The minimum distance between an object and its real image in a convex lens is 4f.
hence,option C is correct.

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