Question: A scientist needs to focus a helium-neon laser beam ( = 633 nm) to a 10-m-diameter spot 8.0 cm behind a lens. a. What focal-length

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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