The critical angle for material of which the equiangular prism ABC shown in figure is made, is 60^(@). A ray of light incident on the side AB of the prism is refracted along DE such that the angle it makes with the side AC is 150^(@) and angleEDB=90^(@). draw the path of the incident ray on the side AB (which travels along DE) and also the path along which the ray DE travels from the point E onwards.

The critical angle for material of which the equiangular prism ABC sho

1.	The critical angle for material of which the equiangular prism ABC shown in figure is made, is 60^(@). A ray of light incident on the side AB of the prism is refracted along DE such that the angle it makes with the side AC is 150^(@) and angleEDB=90^(@). draw the path of the incident ray on the side AB (which travels along DE) and also the path along which the ray DE travels from the point E onwards.
Answer» SOLUTION :The COMPLETED diagram is shown in figure. Since the refracted ray DE is normal to the surface AB of the prism (i.e., `angler=0^(@)`), so the INCIDENT ray at the point D should also be normal to the surface AB so that `anglei=0^(@)`. at the point E, the angle of incidence for the ray DE is `150^(@)-90^(@)=60^(@)` which is equal to the critical angle, so the ray DE is refracted at `90^(@)`, i.e., it is refracted along EC.