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Table. 1.

Design specs for 375 mm Fresnel Lens (Zone area = const.).

Lens No. Semi-dia. (mm) Radius (mm) Focal Length (mm) Central Osculation (mm) Zone Area (mm2)
0th 84.00 202.22 390.00 0.0 22067.1
1st 118.80 208.16 401.43 168.0 22171.6
2nd 145.50 213.95 412.61 237.6 22169.6
3rd 168.00 219.62 423.55 291.0 22160.0
4th 187.83 225.18 434.27 336.0 22167.4
5th 205.00 230.39 444.32 375.7 21189.7
New Phys.: Sae Mulli 2022;72:959~965 https://doi.org/10.3938/NPSM.72.959
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