What is the lens equation


-What is meant by the focal length of a lens or mirror? What is the difference between the focal length of a lens and the image distance? Under what conditions are the focal length and image distance the same?

-What is the lens equation? Define all terms.

-Define magnification.

-What is a real image

-What is a virtual image

-What is a ray diagram? What are 3 principle rays?

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Physics: What is the lens equation
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