Question: 1 6 . CDs store information in tiny 'holes' that are one - quarter as deep as the wavelength of the laser light that 'reads'

16. CDs store information in tiny 'holes' that are one-quarter as deep as the wavelength of the laser light that 'reads' the information. In air, this wavelength is 780 nm, but the depth of the hole is the wavelength measured in the plastic from which most CDs are made, which has a refractive index of n =1.55. Find the depth of the hole.

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