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Homework Help
Advanced Physics Homework Help
Finding the Optimal Lens for Focusing a Helium-Neon Laser Beam
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[QUOTE="strikingleafs01, post: 1524918, member: 101033"] 1. Homework Statement A scientist needs to focus a helium-neon laser beam (lamda = 633nm) to a 10 micrometre diameter spot 8.0 cm behind the lens. a) What focal-length should she use? b) What minimum diameter should she use? 2. Homework Equations w = (2.44lambda * focal length) / diameter theta = 1.22lamda/diameter Wmin is apprx equal to 2.5lambda...apparently, but if you have a separate method ignore this. 3. The Attempt at a Solution i attempted to calculate w through 2.5lambda, then use that to calculate the focal length. the answer i got was 0.001cm. [/QUOTE]
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Advanced Physics Homework Help
Finding the Optimal Lens for Focusing a Helium-Neon Laser Beam
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