A) \[4d\]
B) \[2d\]
C) \[\frac{d}{2}\]
D) \[\frac{d}{4}\]
Correct Answer: D
Solution :
Focal length of a convex lens by displacement method Focal length of the convex lens \[f=\frac{{{a}^{2}}-{{b}^{2}}}{4a}\] where a = distance between the image and object and b = distance between two positions of lens Fact The distance between the two points should be greater than four time the focal length of the convex lens, i.e., d > 4f. So, the maximum possible focal length of this convex lens is\[\frac{d}{4}.\]
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