Think of a hand-held telescope that has the small end about the same size as your eye and the other end a good bit bigger.
Without the telescope you get all the light that would go through the small end in your eye. With the telescope you get all the light that goes into the large end in your eye.
But it’s worse than that, because all the light from the sun that goes into the large end gets focused by the telescope into a spot on your retina that’s much smaller than the small end.
So all that energy coming in the large end is concentrated on one wee spot of your very sensitive retina. And burns a hole clean through it.
Comments