A convex lens of 10 cm focal length is placed in contact


A 10 cm converging lens is placed in contact with a diverging lens. The focal length of the combinations is 30 cm.

Find the focal length of the diverging lens.

A convex lens of 10 cm focal length is placed in contact with a convex lens of 15 cm focal length. What is the focal length of the combination?

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Physics: A convex lens of 10 cm focal length is placed in contact
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