A scientist needs to focus a helium-neon laser beam ( = 633 nm) to a 10-m-diameter spot

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A scientist needs to focus a helium-neon laser beam (λ = 633 nm) to a 10-μm-diameter spot 8.0 cm behind a lens.
a. What focal-length lens should she use?
b. What minimum diameter must the lens have?

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Physics for Scientists and Engineers A Strategic Approach with Modern Physics

ISBN: 978-0133942651

4th edition

Authors: Randall D. Knight

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Question Posted: Nov 14, 2018 07:58 AM

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A scientist needs to focus a helium-neon laser beam ( = 633 nm) to a 10-m-diameter spot

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Model Diffraction prevents focusing light to an arbitrarily small point Model the ...View the full answer

Physics for Scientists and Engineers A Strategic Approach with Modern Physics

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