Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Optics
For a light ray travelling from denser to a rarer medium, if angle of incidence is equal to the critical angle, then the angle of refraction is:
1
90°
2
0°
3
45°
4
More than one of the above
5
None of the above