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The three sisters - Blue Mountains, Australia
© 1990 T. Joyce
Used by permission
The blue mountains, located at 100 km west of Sydney, appear blue.
The blue haze is due to a physics phenomenon called scattering.
Eucalyptus trees release
oil droplets into the atmosphere.
The sunlight hits these droplets
and the different wavelengths
get deflected in
different directions.
The wavelengths corresponding to the
blue are deflected
more than the wavelengths
corresponding to the
red. Our eyes see a
blue haze.