Question

A beam of white light is incident on glass air interface from glass to air such that green light just suffers total internal reflection. The colors of the light which will come out to air are
A. Yellow, orange, red
B. Violet, indigo, blue
C. All colours
D. All colours except green

Answer 1

Correct Answer - A
`C=sin^(-1)((1)/(mu))` and `mu prop(1)/(lambda)`
Yellow, organge and red have higher wavelength than green,so `m` will be less for these rays, consequently critcal angle for these rays will be high, hence if green is just totally internally reflected then yellow, orange and red rays will emerge out.