Question

A convex lens forms the image of the same size of an
object placed at a distance of 20 cm. If another lens is
placed in contact with the first, the image is formed at
a distance of 5 cm from the cornbination on the other
side. What are the focal lengths of the lenses used?
Ans. 10 cm, 6.66 cm.​

Answer 1

Explanation:

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