- Another contributor of loss of concentration at long distances is from the "halo" effect of the sun.

- Since the sun's diameter is 0.5 degrees in the sky, the beams are not parallel.Reflecting them a long distance will result in dispersion.

- The sun’s reflect off a 3 foot mirror at 115 feet away will be 4 feet.

- Math is - sin(0.5)*115 = 1.

At 1 mile the sun's reflection will be the mirror size plus 46 feet