Question

Define rectilinear propagation of light.

Answer 1

1. Rectilinear~ means straight.
2. Propagation~ means travelling of light.

The property of light travelling in a straight lines in a homogenous transparent medium is known as rectilinear propagation of light.

Light does not bend. This is the reason why you are unable to see around a corner.

Light, however, can be manipulated to act as though it is bending.

• Refraction is the manipulation of light by placing an object in its path whose density is different to the surrounding medium. This will cause light to either slow down or speed up, and in doing so, it’s direction will be changed
• Reflection is the bouncing of light off an object. If you place a mirror at a corner, you will be able to “see” around the corner, as light from around the corner is bouncing off the mirror and travelling towards your eyes.