Rule for image formation by ray diagram method

Rule for image formation by ray diagram method

Three Special rays for convex lens

When light ray incident parallel to principal axis.

special ray1
special ray1

When light ray incident from focus.

        

special ray2
special ray2

When light ray incident on the pole.

special ray3
special ray3

Three Special rays for concave lens

When light ray incident parallel to principal axis.

THREE SPECIAL RAYS FOR CONCAVE LENS
THREE SPECIAL RAYS FOR CONCAVE LENS