A laser with 589 nm wavelength and a beam diameter of 2 mm is fed through a beam-expander, then aimed from point A to point B at a distance of 2.75 km. What expansion factor is required for the beam-expander in order that the diffraction-limited spot at point B has a diameter of 30 cm (defined as the diameter of the first dark ring) ?

A laser with 589 nm wavelength and a beam diameter of 2 mm is fed through a beam-expander, then aimed from point A to point B at a distance of 2.75 km. What expansion factor is required for the beam-expander in order that the diffraction-limited spot at point B has a diameter of 30 cm (defined as the diameter of the first dark ring) ?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter6: Photons And Matter Waves

Section: Chapter Questions

Problem 153AP: The spacing between crystalline planes in the NaC1 crystal is 0.281 nm, as determined by X-ray...

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