The light used in a CD has a wavelength of 503 nm (inside the plastic coating), whereas a Blu-ray disc uses a wavelength of 260 nm (again, inside the plastic coating). Based solely on the effects of diffraction, a Blu-ray disc can contain more pits and thus hold more information than a CD. Estimate the ratio of the number of pits that can be on a Blu-ray disc to the number on a CD. How does this answer compare with what you know (or can look up) about the amount of information that can be stored on a CD and a Blu-ray disc?