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Unformatted text preview: Density and Distance Inverse Square Law A change in beam intensity varies inversely with the square of the source image distance. Original Intensity New SID 2 New Intensity = Old SID 2 Easy to remember if doubled or halved: If SID is Doubled: Intensity 1/4 original If SID is halved: Intensity is 4x original...
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- Winter '11
- Inverse, Inverse-square law, Square Law, original mas, Direct Square Law