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  แลกฟรีเครดิต (640 อ่าน)

13 มี.ค. 2564 11:27

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22 พ.ค. 2564 15:45 #1

[url]https://www.potentelaser.es/producto/100mw-puntero-laser-verde-flash/[/url]A laser pointer or laser pen is a small handheld device with a power source (usually a battery) and a laser diode emitting a very narrow coherent low-powered laser beam of visible light, intended to be used to highlight something of interest by illuminating it with a small bright spot of colored light.<a href="https://www.powerfullaserpointer.co.uk/product-category/50mw-laser-pointers/">50mW Laser Pointers</a> Power is restricted in most jurisdictions not to exceed 5 mW.The small width of the beam and low power of typical laser pointers make the beam itself invisible in a reasonably clean atmosphere, only showing a point of light when striking an opaque surface.<a href="https://www.potentelaser.es/producto/100mw-puntero-laser-verde-flash/">100mW puntero láser verde</a> Some higher-powered laser pointers project a visible beam via scattering from dust particles or water droplets along the beam path. Higher-power and higher-frequency green or blue lasers may produce a beam visible even in clean air because of Rayleigh scattering from air molecules,<a href="https://www.bestlaserinc.com/category/3000mw-laser-pointer/">3000mW Laser Pointer</a> especially when viewed in moderately-to-dimly lit conditions. The intensity of such scattering increases when these beams are viewed from angles near the beam axis. Such pointers,ticularly in the green-light output range, ar used as astronomical-object pointers for teaching purposes.

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