Light does not need ___ to travel.
Light is electromagnetic radiation and it requires no medium to travel.
Thus, light does not need a medium to travel.
The correct statement is :
(a) Sound and light both require medium for propagation
(b) Sound can travel in vacuum, but light can not
(c) Sound needs medium, but light does not need medium for its propagation
(d) Sound and light both can travel in vacuum.
Light needs a material medium to travel.
Under what special conditions, light does not travel in a straight line?