focal length of concave mirror is positive or negative why（関連順）

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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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Focal length is positive or negative 🤔🤔#B.edlearning #viralshorts #ray #optics #physics #10thclass

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Which type of mirror has :(a) positive focal length? (b) negative focal length?

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結果 : focal length of concave mirror is positive or negative why