Given that the threshold for a human eye to sense the presence of light is 50 photons
Question:
Given that the threshold for a human eye to sense the presence of light is 50 photons within 0.1 s, what is the minimum power output of a red (λ = 635 nm) laser diode that would make it visible in a darkened room?
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The power can be related to the energy per photon and the ...View the full answer
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Related Book For 
College Physics Reasoning and Relationships
ISBN: 978-0840058195
2nd edition
Authors: Nicholas Giordano
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