Concave Lens - Concave Lens

Japanese: 凹レンズ - おうレンズ

A lens whose center is thinner than its edges. After passing through a concave lens, light parallel to the axis spreads out (divergence) as if it came from a single point (focal point) on the axis on the incident side. The image created by a concave lens is always an erect virtual image, located on the same side as the object, and if the distances from the lens to the object, image, and focal point are a, b, and f, respectively, the relationship in (Equation 1) holds. The ratio of the size of the image to the object (magnification) is equal to b/a. Depending on the shape of both sides of the lens, there are various types: biconcave, plano-concave, and convex-concave (meniscus-concave). → Convex lenses → Related topics Divergence (physics) | Lenses

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

中央が縁より薄いレンズ。軸に平行光線は凹レンズを通った後，入射側にある軸上の一点（焦点）から出たように，広がってすすむ（発散）。凹レンズでできる像は常に正立虚像で，物体と同じ側にあり，レンズから物体，像，焦点までの距離をそれぞれa，b，fとすると，（式１）の関係がなりたつ。像と物体の大きさの比（倍率）はb/aに等しい。レンズの両面の形により，両凹，平凹，凸凹（メニスカス凹）の各種がある。→凸レンズ
→関連項目発散（物理）｜レンズ

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