Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Optics
If an object is placed at a distance of 40 cm from a concave mirror having a focal length of 20 cm, then the magnification produced is:
1
1/2
2
+2
3
-1
4
More than one of the above
5
None of the above