Question

13. A convex lens produces an image of the same size as that of an object, on a screen kept at a distance of 20 cm from the lens. The focal length of the lens is I a) 10 cm b) 20 cm c) 30 cm d) 40 cm​

Answer 1

Answer:

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Answer 2

Answer:

object is at radius of curvature when size of object= size of image,so in this case focal length is 10cm