What propagation of light defines its motion in a straight line?
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.
It is explained that the rectilinear propagation of light property shows that light travels only in straight lines . Will light also travel obliquely vertically and horizontally?