Estimating the storage capacity of a CD/DVD using diffraction.

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Presentation transcript:

Estimating the storage capacity of a CD/DVD using diffraction

CD/DVD drive Image top: Image bottom: (Creative Commons license)

How does a CD/DVD store data? Image: (Creative Commons license)

Wavelength Diffraction order m = +1 Diffraction order m = -1 Distance between rows of pits

Measuring diffraction angles You would record it as follows: Also identify the wavelength of your laser. Then calculate d.