If the initial He-Ne beam is 0.5 mm in diameter, the effective focal length of Lens L1 is 38 cm, what should the focal length of the microscope objective be in order to expand the beam diameter to 4 cm? Hint: Microscope objective and L1 make a Keplerian telescope.

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If the initial He-Ne beam is 0.5 mm in diameter, the effective focal length of Lens
L1 is 38 cm, what should the focal length of the microscope objective be in order
to expand the beam diameter to 4 cm? Hint: Microscope objective and L1 make a
Keplerian telescope.
Transcribed Image Text:If the initial He-Ne beam is 0.5 mm in diameter, the effective focal length of Lens L1 is 38 cm, what should the focal length of the microscope objective be in order to expand the beam diameter to 4 cm? Hint: Microscope objective and L1 make a Keplerian telescope.
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