Consider an optical disk drive with a lens focusing a collimated beam into a mm-thick disk with an index of refraction of n. If disk moves towards the lens a distance, t, how much does the focus shift inside the material? Assume the paraxial approximation and that the focus remains inside the material (i. e. t is not far enough to move the focus past the material). Express your answer in terms of the two given variable
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Consider an optical disk drive with a lens focusing a collimated beam into a mm-thick disk with an i...
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