White light is what the eye sees when wavelengths of all colours reach the eye.
It is a combination of Red, Blue and Green wavelengths of light, that is perceived as white.
You can not see between opaque materials because light cannot pass through them.
Explanation:
what is the end of the question???
B. 1, 2, 1, 2. You balance the equation by making sure there are equal elements on both sides.