If a white light incident on the interface of glass and air as shown in figure and green light is just totally internally reflected, then the emerging ray in air contains

Question

If a white light incident on the interface of glass and air as shown in figure and green light is just totally internally reflected, then the emerging ray in air contains (A) all colours (B) all colours except green (C) yellow, orange, red (D) violet, indigo, blue

Tardigrade Admin · Accepted Answer

Since the green light is totally internally reflected hence for green ray the given angle of incidence is just equal to critical angle ie,

s in i = \frac{1}{n _{g}}

For yellow, orange and red rays refractive indices will be less than

n_{g}

and hence these rays may emerge in air.

Q. If a white light incident on the interface of glass and air as shown in figure and green light is just totally internally reflected, then the emerging ray in air contains

all colours

all colours except green

yellow, orange, red

violet, indigo, blue

Since the green light is totally internally reflected hence for green ray the given angle of incidence is just equal to critical angle ie, sini=ng​1​ For yellow, orange and red rays refractive indices will be less than ng​ and hence these rays may emerge in air.

Since the green light is totally internally reflected hence for green ray the given angle of incidence is just equal to critical angle ie,
$s in i = \frac{1}{n _{g}}$
For yellow, orange and red rays refractive indices will be less than $n_{g}$ and hence these rays may emerge in air.