Question:
Angle of minimum deviation for a prism --- the ray inside the prism:
Angle of minimum deviation for a prism --- the ray inside the prism:
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Minimum deviation = Maximum symmetry. Symmetry means the internal ray is parallel to the base.
Updated On: May 5, 2026
- Passes parallel to the base from outside
- Refracts at only one surface
- Travels parallel to the base inside
- Undergoes total internal reflection
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The Correct Option is C
Solution and Explanation
Step 1: Concept
In a prism, the angle of deviation is the angle between the incident ray and the emergent ray.
Step 2: Meaning
Minimum deviation ($D_{m}$) is a specific state of symmetry where the light ray is bent the least amount possible by the prism.
Step 3: Analysis
At this condition of minimum deviation, the angle of incidence equals the angle of emergence ($i = e$). For an equilateral or isosceles prism, this symmetry forces the internal refracted ray to be parallel to the base.
Step 4: Conclusion
Therefore, at the point of minimum deviation, the ray inside the prism travels parallel to its base. Final Answer: (C)
In a prism, the angle of deviation is the angle between the incident ray and the emergent ray.
Step 2: Meaning
Minimum deviation ($D_{m}$) is a specific state of symmetry where the light ray is bent the least amount possible by the prism.
Step 3: Analysis
At this condition of minimum deviation, the angle of incidence equals the angle of emergence ($i = e$). For an equilateral or isosceles prism, this symmetry forces the internal refracted ray to be parallel to the base.
Step 4: Conclusion
Therefore, at the point of minimum deviation, the ray inside the prism travels parallel to its base. Final Answer: (C)
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