A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is [MNR 1988; MP PMT 1999; Roorkee 2000; UPSEAT 2000; MP PET 2005]A) 45? B) 39? C) 20? D) 30?

A ray of light passes through an equilateral glass prism in such a man

1.	A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is [MNR 1988; MP PMT 1999; Roorkee 2000; UPSEAT 2000; MP PET 2005]A) 45? B) 39? C) 20? D) 30?
Answer» Angle of prism is 60 as it is EQUILATERAL triangle so angle of incidence =3/4*60=45=angle of emergence by using FORMULA i+e=A +d 45+45=60+d d=90-60 d=30

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