When you have a red light it makes the room apear red and?
Firstly, you see things when light enters your eyes. A red light means red light enters your eyes, and makes you see red, and also for other lights. However, black simply means no light. And just by painting a light bulb black and turning it on will not reduce the amount of light which enters the room, from windows etc. Some ideas just don’t work.
The light that we see is made up of radiation of different wavelengths. White light is the combination of all the colours in the visible spectrum ie the colours of the rainbow (red,orange, yellow,green, blue,indigo and violet). When white light (daylight or artificial, electric light from a bulb) hits a pigmented object (a painted wall, for example) the pigment absorbs certain wavelengths and reflects others – so light hitting a blue painted object will absorb all wavelengths except that of the colour blue, which it reflects. This is what we see as blue. If you put light through a filter such as the red glass of a coloured bulb it has the same effect – it absorbs all other wavelengths except red, which it allows through – this gives us a red light. Black “light” as such is not possible because it is the absence of light. Painting a white lightbulb black will stop any light coming through but it does not produce a black light as such. The way to create the darkness you want for your aft
