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What Makes Things Visible?


 

The man in the picture can see the tree.
 

Question

How does this happen?

Solution

The light from the Sun falls on the tree and bounces off on to the eyes of the man. This is how things are visible to us.


 Day to Day Examples

 Example 1



Formation of shadows suggests that light travels in straight lines.


Example 2


If the light has not travelled in a straight line, then light would have taken a curved path around the Earth and there would have been sunlight during night too.


Example 3
 


Beam of sunlight enters a dark room through a ventilator or light from the torch light in the dark room, we can see the light traveling in a straight line.


Example 4
 


Light coming from small LASER confirms that light travels in straight lines.


Example 5
 


Light from projection room in the cinema hall suggest that light travels in straight lines.


Example 6
 

 

Beam of light from the light house suggests that light travels in straight lines.
 


 

Beam of head light of fast moving car identifies that light travels in straight lines.


All these suggest that light travels in straight lines.

This property of light traveling in straight line is called RECTILINEAR PROPAGATION OF LIGHT.





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