The intensity
The light intensity on a screen is inversely proportional to the square of the distance between the screen and the light source.
If a screen is illuminated by a light source 20 m away, the intensity is one-fifth of what is required. Where should the light be placed?
If a screen is illuminated by a light source 20 m away, the intensity is one-fifth of what is required. Where should the light be placed?
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