Question

a ray of light travelling in air is incident on a face of a rectangular slab and comes out from the opposite face. the angle between the incident ray and the normal to the surface is 30 degree. what is the angle between the ray coming out of the slab and the normal to the face from which it comes out? ​

Answer 1

HeYa❣

Here is your Answer---)

total degree =  90

given =60

we know angle of reflection is = Angle of incidence..

so 90-60 is 30 so it is 30degree

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Answer 2

Given that,

Incidence angle = 30°

A ray of light is incident on a face of a rectangular slab and comes out from the other side.

We know that,

Emergence angle :

The angle between the ray coming out of the slab and the normal to the face from which it comes out is called emergence angle.

According to figure,

The incidence angle is equal to the emergence angle.

$i=e$....(I)

We need to calculate the angle between the ray coming out of the slab and the normal to the face from which it comes out

Put the value in the equation (I)

$e=30^{\circ}$

Hence, The angle between the ray coming out of the slab and the normal to the face from which it comes out is 30°