railway DFCCIL MTS 2025 Mock Test Series General Science Physics Optics

कोणत्याही माध्यमाचा अबाधित अपवर्तनांक नेहमी ________ असतो.

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एकापेक्षा अधिक
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0
3
1
4
एकापेक्षा कमी
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