Teaching UP TGT Mock Test Series 2025 Physics Optics Refraction and Reflection

If the power of a lens is - 4.0 D, then it means that the lens is a __________.

1
concave lens of focal length -50 m
2
convex lens of focal length +50 cm
3
concave lens of focal length -25 cm
4
convex lens of focal length -25 m
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