Question regarding Light
I had this strange question in my mind from a long time, but i have to yet get a satisfactory answer:
What is the difference between a naturally emitted colour and a colour which is generated by covering the light source with a translucent cover of a particular colour?
For example: I have a Blue LED whose body/case is actually transparent but on supplying power emits the colour blue naturally. On the other hand, i have a LED which emits a white colour on powering up. Suppose i put some kind of blue translucent film on it, or a translucent paint. I will still get a blue-colour. What are the differences of colour emitted in these two cases?