The formula to calculate the beam spread is:
\(BS = 2 \times D \times \tan(A \times 0.5)\)
Where:
Example 1:
Calculation:
\(BS = 2 \times 10 \times \tan(0.5 \times 0.5) = 2 \times 10 \times \tan(0.25) \approx 2 \times 10 \times 0.255 = 5.1 \text{ in}\)
Example 2:
Calculation:
\(BS = 2 \times 20 \times \tan(1 \times 0.5) = 2 \times 20 \times \tan(0.5) \approx 2 \times 20 \times 0.546 = 21.84 \text{ in}\)