railway RRB Group D Mock Test Series 2024-25 General Science Physics Optics

If a pin is placed in front of the converging lens at a distance of 20 cm, the converging lens forms an image that is real, inverted and equal to the size of the object. Then the power of the lens is:

1

+10 D

2

+5D

3

-5D

4

-10 D

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