A glass prism has as principle cross section a triangle ABC such that ABC= 60°.
A ray SI of red light hits, in air under an angle of incidence of
60°, the face AB of the prism.
The index of refraction of the prism for the incident red light
is n=1.64
1- Study the path of the say SI till it leaves the prism.
2-Determine the value of the angle of incidence of the ray Si so that it would leave the prism grazing it's face AC. ​

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.