Light Travels along a Straight Line

Name the property of light by which it always travels in straight lines.

(Choose from: Rectilinear propagation/Interference)

What is the speed of light in vacuum?

Most objects around us are sources of light.
 

Explain parallel light beam, convergent light beam and divergent light beam with the help of diagram.

An artificial source of light is -

Give an activity to show that light travels in straight lines.

What is meant by rectilinear propagation of light?

Light travels in _____ lines.

The light travels with a lower speed in air than in water.

Formation of shadows suggests that light travels in a

Describe an activity to show that light travels in a straight line.

How does light travel? 

_____ can travel through vacuum.

Fill in the blank with an appropriate word:

Light travels in the form of _____. (Waves/Caves/Games)