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1. Distinguish filters by spectral band: The filter is divided into ultraviolet filter, visible filter, near-infrared filter, infrared filter and far-infrared filter according to the

Shortwave pass filter: cutting off the high frequency is the shortwave pass filter. Usually, it has two meanings. One is to filter out the light

The band-pass filter is a filter adjacent to the cut-off band on both sides of the transmission band of the spectral characteristic curve. According to

Right angle prisms are usually used to turn the optical path or deflect the image formed by the optical system by 90 °. According to

Pentagonal prism is one of the beam steering devices with fixed angle (90 °). It has two purposes: first, the outgoing light turns the incident

Two reflecting surfaces perpendicular to each other are called ridge surface, and the prism with ridge surface is called ridge prism. The ridge prism is

Flat concave cylindrical lens is an optical product, which forms a divergent linear virtual image, which is used to control the size of only one

Introduction to flat convex cylindrical mirror The plane convex cylindrical lens forms a linear image, which is used to control the size of only one