আলোর প্রতিসরণ ও প্রতিফলন

A ray of light OPOP passes through a right angled prism as shown in the adjacent diagram. State the angles of incidence at the faces ACAC and BCBC. Given critical angle is 42o42^o.

হানি নাটস

OP is incident normally on face AB and strikes AC undeviated. Since AQP=45o\angle{AQP}=45^o (total internal angle of a triangle is 180o180^o), the angle of incidence will be 45o45^o. Since, critical angle for glass prism is 42o42^o the ray undergoes total internal reflection with an angle of reflection of 45o45^o. It then strikes BC normally and hence angle of incidence at that face is 0o0^o.

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