White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected, then the emerging ray in air contains
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A
Critical angle, 
or 
As µ decreases with increase in λ. Also, yellow, orange and red have higher wavelength than green, so µ will be less for these rays. Thus, critical angle for these rays will be high, hence if green is just totally internally reflected, then yellow, orange and red rays will emerge out.
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