Question

describe
principal focus and focal length of a concave mirror of a suitable diagram​

Answer 1

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hey mate here is the ans of your qun .

As much as i know i have defined it clearly in note book ....

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Answer 2

The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.