- By being perpendicular to the rays the energy density is higher, the more the angle increases, the more the "number" of rays captured will be reduced per unit area. In other words, the apparent surface of the panel, seen from the sun, is reduced with the angle.
- The glass reflects the rays, if the rays arrive perpendicular to the glass, all enter the panel, the more the angle increases, the higher the proportion of reflected rays is.
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