focal distance of convex mirror is positive or negative（関連順）

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Focal length of convex mirror `M_1` is 20 cm and that of concave mirror `M_2` is 30 cm

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why focal length of convex mirror is positive | why focal length of concave mirror is positive

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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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Focal length of convex mirror `M_1` is 20 cm and that of concave mirror `M_2` is 30 cm .Find pos...

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

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結果 : focal distance of convex mirror is positive or negative