Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Optics
In big showrooms and departmental stores, the vigilance mirror used is a
1
plane mirror
2
convex mirror
3
concave mirror
4
More than one of the above
5
None of the above