Why a DVD stores almost 30 times more in...

Why a DVD stores almost 30 times more information than a CD?

A

DVD uses shorter wavelength lasers of 6350A but CD uses an infarred laser of 7800A

B

CD uses shorter wavelength laser compared to a DVD

C

CD works on the principle of diffraction

D

DVD Works on diffraction of light

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The correct Answer is:

A

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