alleryThe total deviation through a prism is the sum of deviations at how many faces?
AFour faces
BTwo faces
COne face
DThree faces
Answer & Solution
Correct answer: B. Two faces
1. The ray refracts once on entering the prism.
2. It refracts again on leaving.
3. So the total is the sum over two faces.
_Source: syllabus Physics Part II, Chapter 9, Ray Optics and Optical Instruments._
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