The image of a needle placed 10cm from a lens is formed on a wall 20cm on the
other side of the lens.Find the focal length of the lens and size of the image formed,if
the size of the object needle is 2.5cm.
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f=20/3=6.67cm. h2=5cm. so size of image is 5cm. This discussion on the image of Needle placed 10cm from a lens is formed on a wall 20cm on the other side of the lens.
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