拡大鏡は,電子機器の修理,宝石の検査,工芸品の制作,品質のチェックに使用され,凸眼鏡の光屈光に基づいて機能します.

We can easily understand this rule with the candle imaging experiment when a candle is placed inside the focal length of a convex lens the lens forms a large upright virtual image just like how a magnifier works

レンズとキャンドルの間にはより広い視域が広がります レンズとキャンドルの間にはより広い視域が広がります

レンズをキャンドルに近づけると 視野が狭くなる

When the object being observed sits within the focal length of a convex lens light passing through the lens refracts and converges our eyes then perceive an upright enlarged virtual image which makes tiny subtle details visible

One key optical trait worth noting lenses with shorter focal length deliver stronger magnification yet they come with shorter working distance and narrower field of view this is why high-power magnifiers need to stay close to workpieces

Low-grade lenses often bring distorted images and color deviation which can interfere with precise inspection professional optical lenses are refined for better light transmission and less distortion for magnifying lamps matched soft even lighting helps cut shadows and glare easing eye strain during long close work