The retina of a human eye can detect light
Chapter 7, Problem 7.114(choose chapter or problem)
The retina of a human eye can detect light when radiant energy incident on it is at least 4.0 3 10217 J. For light of 600-nm wavelength, how many photons does this correspond to?
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer