Question

why v image distance is taken negative in hypermetropia

Answer 1

So the image distance is positive here. you can easily verify that the focal length is in the positive x direction for a convex lens while it is along thenegative x direction for a concave lens. So f is positive for a convex lens and negative for a concave lens. The reason is the sign altering of v.

Answer 2

Hey mate, here's your answer♥️♥️✨✨

The image distance is taken as negative because the defect point is at the left side of the lens.

Hope it'll help you ✌️✌️✌️