The streaming of light beams coming from the Sun through trees is said to have suggested that light travels in straight line. The particles on the path of light beams are visible to us because

The sun is visible to us a few minutes before the actual sunrise because of :

Light appears to travel in a straight line because –

Which one of the following statements is correct regarding the travel of a light beam from a rare to a dense medium?

The bending of light as it passes from one medium to another is called:

What happens when the sunlight travels through the Earth's atmosphere?