Optics, Physics

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how does a magnifying glass work to produce a large or smaller image?

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a)  A positive point test charge q 0  is placed at the midpoint p among the two equal positive charges q. What forces acts on it at or near this point p?   b)  Two charges 1X10 -

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Show the types of chromatic aberration. What do you understand by Fraunhoffer lines? Explain their origin.

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