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Calculate the BEAM ANGLE of the SPOTLIGHT#1 and SPOTLIGHT#2

Given the following scene on the stage
Spotlight #1
1 meter diameter
Spotlight #2
2 meters diameter
Both spotlights SPOTLIGHT#1 and SPOTLIGHT#2 are place at 20 meters from the stage. You want
to produce a circle of light of 1meter diameter with the SPOTLIGHT#1and a circle of light of 2
meters diameter with the SPOTLIGHT#2

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