engineering recuitment ICAR Technician 2021 Mock Test (Re-Exam) Physics Optics Refraction and Reflection
Which of the following statements is/are true?
1. the focal length of a converging lens is positive
2. the power of a converging lens is negative
3. the power of a converging lens is positive
1
2 only
2
1 and 2 only
3
3 only
4
1 and 3 only