# Can laser get trapped in a waterfall?

## It happens due to a phenomenon called total internal reflection which occurs when light travels through a dense material and hits boundary of a material which has lesser density.

By   |  Published: 11th Jul 2018  8:15 pmUpdated: 11th Jul 2018  9:41 pm

Laser is a secret weapon of science which can travel across incredible distances. And yes, it is actually possible to trap a laser beam in water.

It happens due to a phenomenon called total internal reflection which occurs when light travels through a dense material and hits boundary of a material which has lesser density.

If the critical angle is shallow enough, then, the light will reflect. This is exactly how fibre optic cables work.