A scientist needs to focus a helium-neon laser beam (633 nm) to a 10-μm-diameter spot 8.0 cm behind the lens. ▾ Part A What focal-length lens should she use? Express your answer with the appropriate units. ▸ View Available Hint(s) f = 8.0 cm Submit Previous Answers ✓ Correct Part B What minimum diameter must the lens have? Express your answer with the appropriate units. ▸ View Available Hint(s) D= 6.182 Submit Previous Answers mm ? × Incorrect; Try Again; 8 attempts remaining Check the numerical coefficient in the expression for the minimum spot size used in your calculation
A scientist needs to focus a helium-neon laser beam (633 nm) to a 10-μm-diameter spot 8.0 cm behind the lens. ▾ Part A What focal-length lens should she use? Express your answer with the appropriate units. ▸ View Available Hint(s) f = 8.0 cm Submit Previous Answers ✓ Correct Part B What minimum diameter must the lens have? Express your answer with the appropriate units. ▸ View Available Hint(s) D= 6.182 Submit Previous Answers mm ? × Incorrect; Try Again; 8 attempts remaining Check the numerical coefficient in the expression for the minimum spot size used in your calculation
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter23: Mirrors And Lenses
Section: Chapter Questions
Problem 44P: Two converging lenses having focal length of f1 = 10.0 cm and f2 = 20.0 cm are placed d = 50.0 cm...
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