A converging lens with a focal length of 30 cm is used to create an image of a 2.0 mm long ant. The ant is placed perpendicularly to the optical axis of the lens and the length of the ant is treated as the height(a) If the lens is placed so that the image of the ant is 8mm long, upright, and viewed by looking through the lens, how far away from the ant was the lens placed?
(b) If the lens is placed so that the image of the ant is 8mm long, inverted, and viewed on a screen held some unspecified distance on the other side of the lens to the ant, how far away from the ant was the lens placed?

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|dw:1348068390394:dw|

1/f = 1/do +1/di
Mag. = hi/ho = 4 =-di/do

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