Use the measured water absorption spectrum in the lecture notes to estimate how far light penetrates into water (typically defined as 1/a, where a is the absorption coefficient) at its minimum absorption wavelength in the visible. How about at its maximum absorption wavelengths in the IR and UV? What are these three wavelengths (approximately)? Bees can see some of the near-UV spectrum. Would it be useful for them to be able to see much further into the UV? How about the IR?