Q. The refractive index of the material of a prism of angles $45^\circ -45^\circ -90^\circ $ is $1.5$ . Among the following, which one correctly shows the path of the ray of light incident normally on the hypotenuse side?
NTA AbhyasNTA Abhyas 2022
Solution:
The incident angle on side $AB$ is $45^\circ $
$1.5sin\left(45 ^\circ \right)>1$ .
So, the ray would suffer total internal reflection. Same will happen on the side $AC$ .
Hence, the ray would reflect again and become parallel to the incident ray through side $BC$ .
$1.5sin\left(45 ^\circ \right)>1$ .
So, the ray would suffer total internal reflection. Same will happen on the side $AC$ .
Hence, the ray would reflect again and become parallel to the incident ray through side $BC$ .