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A needle placed at 30 cm from the lens forms an image on a screen placed 60 cm on the other side of the lens.

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A needle placed at 30 cm from the lens forms an image on a screen placed 60 cm on the other side of the lens. Identify the type of lens and determine the focal length.

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u = -30 cm 

v = 60 cm 

u is negative because image is formed on the on the other side of the lens.

It is a convex lens.

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