For an object placed at a distance of 20 cm in front of convex lens, t – InterviewSolution

1.	For an object placed at a distance of 20 cm in front of convex lens, the image formed is at a distance of 20 cm behind the lens. Find the focal length of lens.
Answer» The object distance and image distance are same. So the object is kept at twice the focal length. So the focal length of the convex lens is 10 cm.

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