why is the focal length of a concave mirror negative（関連順）

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The focal length of a concave mirror is negative while that of a convex mirror is positive, why?

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why focal length of concave mirror is negative | why focal length of concave lens is negative

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One of the following does not apply to a concave mirror. This is :(a) focal length is negative (b...

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結果 : why is the focal length of a concave mirror negative