irinaswork6680 irinaswork6680

06-03-2024
Physics

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A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.
a) 30 cm
b) -30 cm
c) 15 cm
d) -15 cm

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