To form an erect image twice the size of an object by using a convex l – InterviewSolution

InterviewSolution

1.	To form an erect image twice the size of an object by using a convex lens of focal length 20 cm, the object should be placed at a distance 'd' from the optical centre of lens. Here 'd' is
Answer» `d lt 20` cm d = 20 cm `d gt 20` cm d = 40 cm Solution :To FORM an erect and magnified image an object must be PLACED between the optical centre and focus point of given convex LENS. As F = 20 cm, hence distance of object from the lens `d lt 20` cm.

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