Why is the focal length positive in convex lens?
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Answer. A concave lens diverges the rays incident on it. So the image will be formed behind the lens. ... you can easily verify that the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens.
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FOCAL LENGTH IS POSITIVE IN CONVEX LENS BECAUSE FOCAL LENGTH DEPENDS ON THE RADII OF CURVATURES AND THE RELATIVE REFRACTIVE INDEX OF THE LENS, NOT ON THE POSITION OF IMAGE.
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