Lenses, including double convex lens and double concave lens, are very important optical components. Different media lenses have different effects. What is the refraction phenomenon of light? In general, light travels in two different media at different speeds, so light travels from one medium to another and travels at the interface when its propagation direction is not perpendicular to the interface between the two media. The direction changes.
For lenses that are also all optical glass materials? Obviously, due to the different materials, compositions, and processes, the lens materials must have different refractive indices.
The material with a large refractive index has a short focal length, and the greater the material density, the more severe the refraction phenomenon.
When light enters the glass, it exhibits three properties: reflection, absorption, and transmission. The nature of light transmitted through the glass is called "transmission" and is expressed as light transmittance.
Light is blocked by the glass and is reflected at a certain angle, which is called "reflection" and is expressed in terms of reflectivity.
After the light passes through the glass, some of the light energy is lost, which is called "absorption" and expressed as absorptivity.
Glass's reflectivity + absorption rate + transmittance = 100%
The average light transmittance of ordinary lighting glass is slightly higher than 80% on average.