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A. You have a candle and a screen, separated by a distance D. One of your lens' can project an image of that candle on that screen when it is a distance D/4 from the screen. When the two lens' are put together, they can project an image of the candle on the screen when the combination is halfway between the two. What is the focal length of the first lens?

B. What is the focal length of the combined lens?

C. What is their combined focal length?

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