Is the antireflection film on the camera lens based on the interference principle of light?

The lens surfaces of cameras and video cameras are coated with antireflection films, and the reflected light is superimposed and weakened by using the interference principle of light, thus increasing the intensity of transmitted light.

Anti-reflection film is also called anti-reflection film. Its main function is to reduce or eliminate the reflected light from optical surfaces such as lens, prism and plane mirror, so as to increase the light transmittance of these components and reduce or eliminate stray light of the system.

In 1930s, Zeiss Company put forward the concept of antireflection film. The lens surface is coated with a layer of magnesium fluoride (mgf2), the thickness of which is a quarter of 550nm, so that the middle band of visible light can be completely transmitted, but the light at the edge band of visible light can not be completely transmitted and has residual reflection, and the reflection is strong in the blue band, so the coating we see shows blue reflection, commonly known as blue film.

The average reflectivity of the blue film is about 65438 0.5%. This kind of film is the first generation antireflection film, because there is only one layer, so it is also called single layer film. Still taking Forester 10X50 as an example, if the glass-air contact surface is completely coated with blue film, the energy lost by the reflection of the contact surface of the whole telescope is about 15%, which is much less than that without coating.

Extended data

Anti-reflection film is a widely used optical film, which is widely used in daily life, industry, astronomy, military science, electronics and other fields. With the development of electronic industry and computer, anti-glare and anti-static film for display and computer display screen have become new application fields of anti-reflection film and have broad market prospects. It can not only effectively improve the conversion efficiency of the battery, but also improve the physical and chemical properties of the matrix such as mechanical properties, electrical properties and optical properties.

The application of silicon material in solar cells is a semiconductor material, and the principle of solar cell power generation is mainly to use the photoelectric effect of this semiconductor.

The refractive index of silicon is large, so the light shining on the surface of silicon can not be completely absorbed, but a large part is reflected. In order to minimize the reflection loss, one or more antireflection films with refractive index and thickness matching the battery can be plated on the battery to improve the conversion efficiency of the battery.

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