Convex Mirror Focal length | convex mirror focal length positive or negative
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薄レンズ方程式、収束レンズと発散レンズの光線図と符号規則
focal length condition to be negative or positive
When is object distance negative?
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Convex and Concave Lenses
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Discussion on negative focal length devices: convex mirror and concave lens
focal length of a concave mirror
why concave mirror focal length is negative and convex mirror focal length is positive ! its rules