Magnifying glass - magnifying glass
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Also known as a magnifying glass or loupe. A convex lens used to see a magnified virtual image (erect image) of an object. The magnification is expressed as the number obtained by dividing the distance of clear vision, 25 cm, by the focal length. Up to about 5x, a biconvex single lens is used, and for anything above that, an achromatic tablet is used to correct chromatic aberration. → Related items Visibility distance Source : Heibonsha Encyclopedia About MyPedia Information |
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虫めがね，ルーペとも。物体の拡大された虚像（正立像）を見るため使う凸レンズ。倍率は明視の距離25cmを焦点距離で割った数で表される。５倍くらいまでは両凸の単レンズ，それ以上は色収差を補正した色消しタブレットを使う。 →関連項目明視距離 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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