If i shine white light onto a yellow surface with black text; will the text be clearer than if i shone a yellow light onto it?
The white and the yellow light would give the same clarity. In both cases the yellow section would reflect yellow and the black text would not reflect anything.
They should be the same. This is because a yellow surface ONLY appears yellow because it absorbs all other frequencies of light but NOT yellow frequencies. because true white light is made up of all frequencies of visible light. (note: your light sources at home are generally not completely white they are missing some frequencies) So if you shine a white light on it the only light you will see is still yellow, all others are absorbed. If you shine a yellow light on it nothing is absorbed but the exact same wavelength of light is reflected off as when you used a white light. HOWEVER, in practice you would have to match the yellow light source exactly to the wavelengths of light that the yellow surface would reflect. It's easier to use white light because it already includes all of the frequencies of light that the surface would reflect.
there is no such thing as colored light... light can be manipulated into different colors by transparent matter however
There will be no difference in the clarity (resolution).
