19. moonlight at high noon the fact that sunlight is ab- sorbed by water is well known to any diver who has dived to a depth of 100 feet. if 25 feet of water absorb 15% of the light that strikes the surface, at what depth will the light at noon be as bright as a full moon, which is 1/300,000th as bright as the noonday sun? see figure 2.12.