If the distance between an object and a screen is C = i + o = 50 cm, and you pla

Question

If the distance between an object and a screen is C = i + o = 50 cm, and you place between them a double-convex lens of focal length 10 cm, you will find that an image is produced on the screen when

1. the lens is only at 10 cm from the screen
2. the lens is only at 40 cm from the screen.
3. the lens is either 10 or 40 cm from the screen.
4. the lens is only at 12.83 cm from the screen.
5. the lens is only at 37.17 cm from the screen.
6. the lens is either 12.83 or 37.17 cm from the screen.
7. the lens is only at 13.82 cm from the screen.
8. the lens is only at 36.18 cm from the screen.
9. the lens is either 13.82 or 36.18 cm from the screen.
10. the lens is 25 cm from the screen.

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