Angle of Deviation in a Glass Triangular Prism Experiment

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Chirag Gupta
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In an experiment to trace the path of a ray of light through triangular glass prism.
Can the angle of deviation be zero? Why?
 
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CWatters said:
What do you think?
The answer for a rectangular prism would be yes.

PS: I assume that we can discount shining the beam down the length of the prism.

Not a rectangular prism , a triangular prism with angle of prism = 60degrees .