he minimum beam waist

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A ×20 microscope objective (for a microscope of standard tube length 160mm) is used to
launch collimated laser light of wavelength 835 nm and beam waist 2w=0.4 mm into an
optical fibre. What is the minimum beam waist 2 wo (in micrometers)?
Transcribed Image Text:A ×20 microscope objective (for a microscope of standard tube length 160mm) is used to launch collimated laser light of wavelength 835 nm and beam waist 2w=0.4 mm into an optical fibre. What is the minimum beam waist 2 wo (in micrometers)?
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