What is the minimum spot size of a Blu?ray laser if its wavelength is 405 nm and the lens has a numerical aperture of 0.85?
What will be an ideal response?
The numerical aperture, Na, is 2?/?D. If ? = 405 nm, D = 2?/?Na = 2 × 405/3.142 × 0.85 = 303 nm.
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