Teaching Rajasthan 3rd Grade REET Mains (Level I & II) Mock Test Physics Optics Refraction and Reflection

If the focal length of the biconvex lens is 30 cm, then the power of the lens will be

1

+4 dioptre

2

-3.3 dioptre

3

+3.3 dioptre

4

-4 dioptre

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