factory direct sales handheld 10x diameter 80mm reading and reading magnifying glass imitation wooden handle gold-plated magnifying glass hot sale

60MM one piece 300, 70MM one piece 240, 80MM one piece 180, 90MM one piece 180, 100MM one piece 180[Material]: Plastic frame + glass lens

[Features]: Simple and Elegant

[Packing]: Color Box

[Function]: Local magnification, identification of genuine and counterfeit currency, philately, circuit inspection, appreciation of antiquities, jade, etc.

[尺寸]：60mm/70mm/80mm/90mm/

Usage: Hold the magnifying glass in your right hand, ensuring that the lens is parallel to your line of sight. With your left hand, hold the object you want to observe against the light source and slowly move it towards the lens. As you move the object to be identified, adjust the observation position accordingly.

[Imaging Principle]: Optical lenses made of curved-surface glass or other transparent materials can magnify objects and form images, as shown in the optical path diagram in Figure 1. For objects AB within the focal point F of the object, with a size of y, they are magnified into an imaginary image A'B' of size y'.
Magnification of a magnifying glass
Γ=250/f'
In the formula, 250 represents the distance at which the object can be clearly seen, measured in millimeters.
f' -- magnifying glass focal length, in units of mm
The magnification refers to the ratio of the angle of view of an object observed with a magnifying glass at a distance of 250mm to the angle of view of the same object observed without a magnifying glass.

Kindly Reminder: The above prices are based on a 70mm diameter wood handle. For the price of similar products, please contact us directly.