Question: Example 23-16 shows how to use a converging lens to measure the focal length of a diverging lens. (a) Why can't you measure the focal

Example 23-16 shows how to use a converging lens to measure the focal length of a diverging lens.
(a) Why can't you measure the focal length of a diverging lens directly?
(b) It is said that for this to work, the converging lens must be stronger than the diverging lens. What is meant by "stronger," and why is this statement true?

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