Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Physics Optics Refraction and Reflection
Find the focal length of a convex lens of focal length 50 cm in contact with a concave lens of focal length 40 cm? Also find the correct lens system?
1
300 cm, converging lens
2
200 cm, diverging lens
3
200 cm, converging lens
4
More than one of the above
5
None of the above