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. Violet, Indigo, Blue
• B. All colours except Green
• C. Yellow, Orange, Red
• D. White light

Answer 1

The correct option is C Yellow, Orange, Red

Critical angle $sini=\frac{1}{\mu }$
In total internal reflection, sine of critical angle of reflection is inversely proportional to the refractive index of material for a given wavelength. This means that those wavelengths that have less refractive index than green (yellow, orange and red) bend less, and are not able to reflect back (as no T.I.R), and thus come out to the air.