Prism Minimum Deviation
At minimum deviation, the prism condition entails?
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About This Question
- Subject
- physics
- Chapter
- optics
- Topic
- prism minimum deviation
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Incident and emergent angles equal
- Prism Deviation ((\delta)): The angle between the incident ray and the emergent ray.
- Condition for (\delta_{min}): When the angle of incidence (i) is adjusted such that the deviation is at its absolute minimum value:
- The angle of incidence equals the angle of emergence (i=e).
- The refracted ray inside the prism is parallel to the base of the prism (for an equilateral/isosceles prism).
- Refractive Index Relation: At this point, n=sin(A/2)sin((A+δm)/2), where A is the prism angle.
- Conclusion: The symmetric path through the prism corresponds to the minimum deviation point.
This hard difficulty physics question is from the chapter optics, covering the topic of prism minimum deviation. It appeared in the 2025 exam.
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