Question

if the distance between point source and the screen is doubled then the intensity of light on the screen will become? explanation?

Answer 1

Answer:Intensity, I∝  

R  

2

 

1

​  

, where R is the distance between a point source of light and a screen. If R is doubled then we have  

I  

′

∝  

4R  

2

 

1

​  

=  

4

I

​  

 

Hence intensity will be one quarter of the original value.

Explanation: