50mm Straight Handle Student Magnifying Glass One Yuan Store Daily Necessities Wholesale for the Elderly Reading and Reading Newspapers_顺宏光学

50mm Straight Handle Student Magnifying Glass One Yuan Store Daily Necessities Wholesale for the Elderly Reading and Reading Newspapers

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50mm Straight Handle Student Magnifying Glass One Yuan Store Daily Necessities Wholesale for the Elderly Reading and Reading Newspapers

50mm直柄学生放大镜一元店日用百货批发老人读书看报用

EXW Price: Min. order:

¥0.7
≥1200/piece

¥0.66
≥3000/piece

¥0.64
≥6000/piece

1200 piece

Exchage Rate 1 CNY ≈ 0.142 USD
Stock num 99999 piece

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Supplier

顺宏光学

Description

材质]：塑料柄+玻璃镜片

[特点]：简洁大方

[包装]：彩盒 10个一中盒 600个一箱

[功能]：局部放大，看报、集邮、鉴赏字画等

[尺寸]：50mm

[使用方法]：右手持放大镜，使得镜头与视线平行，（距离成像清楚且倍数最大时最佳）左手拿着需要观察的物体对着光源慢慢靠近镜头，在移动被鉴定物体时候找适合的观察位置，效果就十分明显了。

[成像原理]：表面为曲面的玻璃或其他透明材料制成的光学透镜可以使物体放大成像，光路图如图1所示。位于物方焦点F以内的物AB，其大小为y，它被放大镜成一大小为y 的虚像A B 。
放大镜的放大率
Γ=250/f
式中250--明视距离，单位为mm
f --放大镜焦距，单位为mm
该放大率是指在250mm的距离内用放大镜观察到的物体像的视角同没有放大镜观察到的物体视角的比值。

Update time：20220307234118