The colors of light that televisions primarily use to make a picture are . Red, Black, and Green
Red, Yellow, Blue
Red, Green, and Blue
Green, Blue, Purple

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.