is the focal length of a convex mirror negative or positive（関連順）

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凸面鏡の場合の焦点と焦点距離という用語の意味を、ヘルツ波を使って説明してください。

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why concave mirror focal length is negative and convex mirror focal length is positive ! its rules

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Focal length of a convex mirror is 10 cm

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凸面鏡の焦点距離は 20 cm で、曲率半径は | 12 | 光線光学 |... になります。

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Doubt Class 002- Why the focal length of convex & concave mirror is positive & negative respectively

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結果 : is the focal length of a convex mirror negative or positive