| Customization: | Available |
|---|---|
| Magnification: | 5X/4X/2.5X/2X/1.75X |
| User: | All |
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| low price Large Magnifying Glass portable Handheld Reading Magnifier | |||||
| power | 5X | 4X | 2.5X | 2X | 1.75X |
| lens diameter | 50MM | 65MM | 75MM | 90MM | 100MM |
| Pcs/carton | 240PCS | 240PCS | 240PCS | 120PCS | 120PCS |
| Weight/carton | 12KG | 18KG | 25KG | 20KG | 21KG |
| carton size | 40x29x32cm | 41x30x38.5cm | 44x37x45cm | 51x40x23cm | 61x46x24cm |
| A magnifying glass is a use of a convex lens that causes the object length to be less than the focal length, resulting in a magnified virtual image. When the object distance changes, the image distance also changes, and the law is: 1/object distance+1/image distance=1/focal length. For the use of a magnifying glass, it is also stipulated that the magnification of the image at a clear viewing distance (25 centimeters) is the magnification of the magnifying glass. So the following formula can be derived: amplification factor=1+25/f. Where f is the focal length, in centimeters. | |||||
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