Civil Services Uttar Pradesh (उत्तर प्रदेश) PCS Mock Test Series 2025 General Science Physics Optics

The magnitude of focal length of a concave lens is 2 m. What is the power of the lens?

1
+0⋅5 dioptre
2
-0⋅5 dioptre
3
+2⋅0 dioptre
4
-1⋅0 dioptre
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