The lens maker equation:
f is the focal length, si is the image distance, and so is the object distance.
Explain why you cannot measure the focal length directly for a diverging lens. Using no more than four sentences, explain why the technique of placing the diverging lens touching another converging lens with the light reaching the converging lens first, allows you to determine the focal length of the diverging lens.
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What scientific concept do you need to know in order to solve this problem?
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