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how is Pr equal to 680nm in this when it doesn't even lie in the range of Pr  or  Pfr
I can't understand the logic in the answer. Please explain.

Asked by vidyuti.varma 16th June 2016, 11:00 PM
Answered by Expert
Answer:
If you observe the wavelength range for Pr which is 660-665 nm, the closest wavelength is 680 nm.
Answered by Expert 17th June 2016, 1:47 PM
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