A boat has green light of wavelength 
on the mast. What wavelength would be measured and what colour would be observed for this light as seen by a diver submerged in water by the side of the boat? Given 
.
A
Green of wavelength 
B
Red of wavelength 
C
Green of wavelength 
D
Blue of wavelength 
Text Solution
Verified by ExpertsThe correct answer is:
A
: Here, 
As 
where subscripts 
and 
for air and water respectively.
Colour of light is determined by its frequency not by its wavelength. As frequency does not change on refraction, therefore colour will not change and will remain green.
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