Quick question on light intensity (ISL)

[Adrian]

Take a look at these pictures:

 

 

 

 

 

In the first picture I have a light directly on that one square inch of paper, now if I move the light up, the square piece of paper will get less light...now if more pieces of paper are placed in the second pic to fill up the area of the light...would this equal the same amount of light as in the first pic under optimal conditions?

 

Also, if I have a light bulb that emits light in all directions...if I add a reflector on top of that bulb to direct light to a certain point...how does that work with the inverse square law? Does the inverse square law only work with light emitting in ALL directions? What would change?

 

There is a huge discussion going on in another forum, but I needed to get some answers from a board that knows what they are talking about

 

Thanks guys..haven't been on here in a LONG time!