What is rectilinear propagation of light? Give examples.
The property of light travelling in a straight line is called as the rectilinear propagation of light .
A light source can be seen only if there is a straight-line path between the source and our eyes.
- Sunrays entering a dark room through a small opening appear to travel in a straight line.
- Light from torch, headlights of cars, etc. appears to travel in a straight line.
- Light from a projector travels in a straight line in the form of light rays towards the screen.
- Light emitted from a laser pointer appears to travel in a straight line.