First slide

Refraction of light

Question

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

Moderate

A

Yellow, orange, red
B

Violet, indigo, blue
C

All colours
D

All colours except green

Solution

$C = \sin^{- 1} (\frac{1}{μ}) and μ \propto \frac{1}{λ}$
Yellow, orange and red have higher wavelength than green, so $μ$ will be less for these rays, consequently 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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