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The mathematical use of p and q for object distance and image distance is due to the simple likeness of p and q. They use p and q to show you how both distances are a like and yet exceedingly different. Some say that it is just the slightest amount of luck that they are a like like this, but those people are stupid because you and i know it is false

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Q: Why do they use p and q for object distance and image distance?
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