Identification method of flat mirror

1. Identify the level of surface finish. It can be distinguished with the help of a black background under a 60-watt incandescent lamp. High-quality products should not have obvious scratches, pitting, chipping, sand holes, water ripples, bubbles and other surface defects.

2. Put the glasses about 33 cm in front of your eyes. When you look at the object through the glasses, there should be no obvious phenomenon of getting bigger or smaller, and there should be no feeling of jumping. Otherwise, there is a problem with the quality of the glasses.

3. Through the identification of the instrument, the three slices have the same degree and no disorder is better.

4. Check whether the trademark, manufacturer, and quality certificate are authentic and reliable. The lens of international brand-name products is often engraved with the manufacturer's trademark, which can be found by carefully observing the edge of the lens.