Question

With which colour we don't need for medium?

Answer 1

With red colour we don't need for medium.

God bless you dear

Answer 2

Explanation:

We know that light doesn't need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels. Light contrasts with sound, which travels through the air (or some other material medium