The UV side or tanning problems

    I think many of us have heard that spending a lot of time in the sun is bad. Of course, for many, a delicate golden skin tone is more attractive than a snow-white version, but you need to clearly understand that everything is not so simple. If you are naturally light-skinned, then UV radiation should be avoided as much as possible. Otherwise, photo-aging of the skin, increased risk of melanoma and other “joys” will be a “bonus” to tanning.

    Thomas Leveritt , an English artist, was able to demonstrate what is happening to us due to ultraviolet rays. We used a special camera whose optical system is transparent to ultraviolet radiation. Such optics are extremely expensive, since the lenses must be made of special quartz glass.

    at 2:50, the difference between the photocomposite fillings in a different spectrum is clearly visible. The girl practically does not see the material from which she is made. Pay attention to the right central incisor in the normal and UV spectrum

    Bit of theory

    Nikon UV-Nikkor 105mm f / 4.5 (Ai-S) - an extremely rare macro lens for 35 mm SLR cameras Nikon F is designed for special shooting in the soft ultraviolet range. Issued more than three thousand copies.

    The wavelengths of UV radiation lie in the range from 10 to 400 nm. Three main ranges are usually distinguished:
    1) Ultraviolet A, long-wavelength range 400 nm - 315 nm
    2) Ultraviolet B, medium-wavelength 315 nm - 280 nm
    3) Ultraviolet C, short-wavelength 280 nm - 100 nm

    4) Extreme 121 nm - 10 nm. We do not consider this range, since it is completely absorbed by the atmosphere. (Thanks to NeGO for the addition)

    As you know, with increasing frequency, the photon energy grows, and hence the damaging effect. But with increasing frequency, the penetration depth also decreases. As a result, the short-wave spectrum causes severe superficial burns (a quartz lamp), and the long-wave spectrum penetrates deep into the skin, causing damage and mutations in the growth zone. He is responsible for photoaging and potential oncology.

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