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A lantern gives an image of 3m square of a side 7.62cm² on a screen. If the screen is 10m from the projection lens of the lantern, calculate the focal length of the lens?
6 years ago

Answers

oobleck
the side of the projection is √7.62 = 2.76 cm
Now you can use your usual formula to find f, since you have the object and image sizes.
6 years ago

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