×
Create a new article
Write your page title here:
We currently have 3,187 articles on s23. Type your article name above or create one of the articles listed here!



    s23
    3,187Articles

    When an object absorbs all frequencies in a spectrum approximately from 380 nm to 740 nm EXCEPT the ones around a wavelength of about ~ 625–740 nanometers and at a frequency of about ~ 480–405 TeraHertz, then humans say "the object IS red".

    compare: green,blue,violet,yellow,orange

    (*)A "red" apple does not give off "red light", and it is misleading to think of things that we see, or of light itself, as objectively colored at all. Rather, the apple simply absorbs light of various wavelengths shining on it to different degrees, in such a way that the unabsorbed light which it reflects is perceived as red. An apple is perceived to be red only because normal human color vision perceives light with different mixes of wavelengths differently—and we have language to describe that difference. [1]

    Cookies help us deliver our services. By using our services, you agree to our use of cookies.
    Cookies help us deliver our services. By using our services, you agree to our use of cookies.