An object 20 cm tall is placed on the principal axis of a convex lens . its 30 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. calculate the focal length of the lens.
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1/focal length = 1/15 + 1/10
focal length = 15*10/25
= 6 cm
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focal length = 15*10/25
= 6 cm
hope it helps you
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