railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Physics Optics

An object is placed in front of a concave lens of focal length 15 cm and an image is formed at 7.5 cm. Then the magnification of the lens is:

1
0.50
2
1.5
3
0.75
4
1.25
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