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Filter is an optical device used to select the required radiation wave band. A common feature of filters is that no filter can make the

The plane reflector of the projector is made of polished flat glass bricks and vacuum coated. Special attention should be paid to maintenance. The plane

In 1611, German astronomer Kepler first used two biconvex lenses as objective lens and eyepiece respectively, which significantly improved the magnification. Therefore, later generations called

Achromatic doublet glued lens is an optical design that combines two single lenses. The two lenses are made of glass with different refractive index and

Is the lens focal length the same as the camera focal length? Because the shorter the focal length of the convex lens, the greater the

Color filter is an optical filter that represents color. It can accurately select the light wave in a small range to pass through, and reflect