why do light rays converge back to form image and not front when the object is between focus and principal axis

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Solution

The light rays converge back to form the image in case of a concave mirror when the object is beyond F. When the object is between the focus, F and pole, then the light rays seems to meet in the front and thus form the virtual image. For the mirror, the light rays always gets reflected. The reflected rays are either converged or diverged or parallel. If the light rays actually meet then the real image is formed and if the light rays seems to meet then it forms virtual image in front of the mirror.

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Q. When a beam of white light parallel to the principal axis is refracted through a convex lens, then the rays converge to the principal axis. If a screen is placed at a sufficient distance from the focus-point perpendicular to the principal axis then the image on the screen will be.

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BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.

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A concave mirror can converge parallel beams of light at one point. But rays originating from the focus after reflection does not always travel parallel to the principal axis.

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