factory direct sales 80mm dragon handle advanced exquisite dragon pattern magnifying glass 10 times magnifying glass gift magnifying glass

Material]: Plastic frame + high-grade glass lens

[Features]: Elegant and Simple

[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 Method]: Hold the magnifying glass in your right hand, ensuring that the lens is parallel to your line of sight. (Make sure the distance is clear and the magnification is large). 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, find the observation position, and the effect will be very obvious.

[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 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 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 the 80 Dragon Pattern. For the price of similar products, please contact us directly.