Angle of deviation
Geometry
Level
2
A light ray incidents on an equilateral triangle with an angle of 30 degree. Find the angle of deviation of the emergent light ray if the angle of emergence from the second surface is 70 degree.
53 degree
30 degree
40 degree
None of the above
85 degree
35 degree
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1 solution
Angle of incidence(i1)=30 degree Angle of emergence(i2)=70 degree Angle of prism(A)=60 degree since the prism is an equilateral prism i1+i2=A+d d=i1+i2-A d=70+30-60 Angle of deviation(d)=40 degree