Explain the rules for obtaining images formed by a convex lens with the help of ray diagram.

Explanation

When an objects is placed in front of a lens, the light rays from the object fall on the lens.
Rule -1 : When a ray strikes convex lens obliquely at its optical centre, it continues to follow its path without any deviation.

Rule -2 : When rays parallel to the principal axis strikes a convex lens, the refracted rays are converged to (convex lens) the principal focus.

Rule -2 : When a ray passing through (convex lens) the principal focus strikes a convex lens, the refractive ray will be parallel to the principal axis.