Füüsikas võib termin „valgus“ viidata laiemalt mis tahes lainepikkusega elektromagnetkiirgusele, olenemata sellest, kas see on nähtav või mitte, ja selles mõttes on ka gammakiired, röntgenikiired, mikrolained ja raadiolained valgus.
In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not, and in this sense, gamma rays, X-rays, microwaves and radio waves are also light.
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