defence exam BSF Head Constable (RO/RM) Mock Test 2023 Physics Optics Polarisation

किसी अन्तरापृष्ठ के लिए ब्रूस्टर कोण  ib होना चाहिए:

1
45° < ib < 90°
2
ib = 90°
3
0° < ib < 30°
4
30° < ib < 45°
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