Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Optics
The radius of curvature of a spherical mirror is the distance between:
1
centre of curvature and pole
2
centre of curvature and infinity
3
principal focus and centre of curvature
4
More than one of the above
5
None of the above