Volume Volume1\Light and Shade\Book5
Entry# 208.
Contents: Vol. 1 | Vol. 2
Experiments with the mirror (208-210).
THE MIRROR.
If the illuminated object is of the same size as the luminous body
and as that in which the light is reflected, the amount of the
reflected light will bear the same proportion to the intermediate
light as this second light will bear to the first, if both bodies
are smooth and white.