Shining a flashlight beam into a glass of milk  is the examples of tyndall effect.

 

Solution:

Concept: The Tyndall effect is the name given to the phenomenon of light scattering by particles in a colloid or in a very fine suspension. 

The beam is visible because of the way the individual suspension particles scatter and reflect light. 

The Tyndall effect can be clearly seen by shining a flashlight beam into a glass of milk. If you want to see how the colloid particles affect the light beam, you might want to use skim milk or dilute the milk with some water.

Hence, Shining a flashlight beam into a glass of milk  is the examples of tyndall effect.