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Define the terms focus and focal length ...

Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.

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Focus of concave mirror : The focus of a concave mirror is a point on the principal axis at which the light rays incident parallel to the principal axis, after reflection from the mirror meet.
Focal length of concave mirror: The distance of focus F from the pole P of the mirror is called the focal length of the mirror.
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Knowledge Check

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