Question

Why light travel in straight line?

Answer 1

Light is emitted by a source in a certain direction. As it travels through a medium if nothing interacts with the light then it will continue to move in the same direction a la newtons inertial law (light can be few as particles called photons). Now it it travels from one medium to a different one at a non-perpedicular angle it will change directions.

Answer 2

Fantastic

Answer 3

see this link
http://www.le.ac.uk/se/centres/sci/selfstudy/lac1.htm

Answer 4

everything in this universe including light travels in a straight line unless acted upon by some force which tends to change it's state (motion or rest)

Answer 5

light doesn't actually travel in a stright line, it travels in a wave, learn more about wave optics, you will understand, also study electromagnetic waves (light is one) .

Light actually bends when it encounters obstacles of the size of its wavelength

To prove tthis u can try the Interference experiment