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A concave lens has a focal length of -35 cm . Find the image distance and...

A concave lens has a focal length of -35 cm . Find the image distance and magnification that results when an object is placed 18 cm in front of the lens.

fiind di in cm and m

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Answer #1

1/f = 1/di + 1/do

=> 1/-35 = 1/di + 1/18

=> di = -11.89 cm

m = di/do = 11.89/18 = -0.66

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