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Sign convention for image distance in convex mirror
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Sign convention for convex mirror in image distance is positive . You can also find out by cartisian plane because its all four sides have - and +
The convex lens converges the incident rays. Hence, rays converge to a single point in front of lens. So, image distance is positive here. The focal length will be in positive direction for a convex lens while it is along negative direction for a concave lens. So, f is positive for a convex lens. Reason is sign altering of v.
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