When an object is placed 20cm away from a convex lens ,no image is obtained on either side of the lens? what is the focal length of the lens?
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focal length of the image is 20cm as no image formed on either side..... the image will be formed on right side at Infinity which will be real and inverted so when an object is placed at focus the image is formed at at infinity therefore focal length of a convex lens is 20 CM
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