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Silly light questions!

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  • 30-03-2002 4:42pm
    #1
    stereo_steve
    Registered Users Posts: 1,226 ✭✭✭


    Just wondering how passing white light through a coloured lens changes the colour of the light? How does it change the wave lenght of the light?

    Heres the silly question! Ultra violet light cannot be seen by the eye. Would it be possible to wear a suit that emits loads of ultra violet light and appear to be invisible! Or would that just not work because its a completely silly idea?


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    #2
    Sir Digby Chicken Caesar
    Banned (with Prison Access) Posts: 23,556 ✭✭✭✭Sir Digby Chicken Caesar


    Ultra violet light cannot be seen by the eye

    and so any suit emmiting ultra violet light would be easy to spot because we couldn't see the light it was emmiting.

    just a if it wasn't emmitting anything at all

    alright, how the hell do you spell emitt?..


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    #3
    Victor
    Registered Users Posts: 78,290 ✭✭✭✭Victor


    Originally posted by stereo_steve
    Just wondering how passing white light through a coloured lens changes the colour of the light?
    'White' light is made up of light across the visible spectrum, it is composed of a series of wavelengths. The filter 'subtracts' the other wavelengths. The coloured are will be darker that white area.
    Originally posted by stereo_steve
    How does it change the wave lenght of the light?
    It doesn't. I imagine there are very few materials that can change the wavelength of light (perhaps some photo-sensative materials do).
    Originally posted by stereo_steve
    Heres the silly question! Ultra violet light cannot be seen by the eye. Would it be possible to wear a suit that emits loads of ultra violet light and appear to be invisible! Or would that just not work because its a completely silly idea?
    Not completely silly. What you are ignoring is the 'normal' light that would be reflected by the suit. If the suit doesn't reflect normal light, then it will appear black to the human eye. It may look different say an infra red camera (but likely black) and a UV camera ('coloured', but those colours would need to be shifted to the visible spectrum for a person to see).

    However, if I had this UV camera, you would be very obvious to me.


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    #4
    Victor
    Registered Users Posts: 78,290 ✭✭✭✭Victor


    Originally posted by Mordeth
    just a if it wasn't emmitting anything at all alright, how the hell do you spell emitt?..

    Emit
    Emitting


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