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Dear student,
Only a convex lens can create a virtual image that is situated at a distance > centre of curvature when the object is placed in between focus and pole.
So the nature of lens =convex, so focal length is considered to be positive.
Regards
Only a convex lens can create a virtual image that is situated at a distance > centre of curvature when the object is placed in between focus and pole.
So the nature of lens =convex, so focal length is considered to be positive.
Regards