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The focal length of the lens is 20 cm and the object is placed at 10...

The focal length of the lens is 20 cm and the object is placed at 10 cm. I calculated the Di to be -20. Where does the image appear? Is it upside down?How do i know if its real or virtual

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I 10 Lens the lens where the same side of (1) Image appear on the ob object is kept (11) same ray will lii) It is erect orien

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