Observing light from distance

  • Thread starter u2_wa
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  • #1
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Which visible light frequency i.e red, yellow , green etc can be seen from greatest distance? and why?
 

Answers and Replies

  • #2
Danger
Gold Member
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Welcome to PF, U2_wa.
The answer to your question is primarily dependent upon who or what is doing the observing. Different sensors have different ranges of sensitivity to various frequencies.
 
  • #3
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Yellow. I believe that's the human eyes' most sensitivity to "color"
 
  • #4
Nabeshin
Science Advisor
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Yellow. I believe that's the human eyes' most sensitivity to "color"

Human eye sensitivity is actually peaked in the green, ~550nm.
 
  • #5
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Thanks. I learn something new each day, especially here at PF!
 
  • #6
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Some people perceive 550 nm as a greenish yellow/yellowish green.
 

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