Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Physics Optics Refraction and Reflection

The refractive index of a prism with apex angle A is cot A/2. The angle of minimum deviation is : 

1
δm = 180° – A 
2
δm = 180° – 3A 
3
δm = 180° – 4A 
4
δm = 180° – 2A 
5
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