Question

write any two laws to draw ray diagrams for lenses

Answer 1

A ray parallel to principal axis would converge or diverge from focus
A ray passing or appearing to pass from focus would become parallel to the principal axis
A ray passing through centre of curvature would reflect along the same path.

hope it helps you

Answer 2

Hi dear,
Here's your answer...

©Rays of light incident in a direction through the optical centre of a lens is refracted along the same straight line without any deviation (Fig: A and B)
©Rays incident in a direction parallel to the principal axis after refraction passes through the principal focus (in the case of a convex lens) [fig (C)] or appear to diverge from the principal focus (in the case of a concave lens) [fig (D)].
©A ray of light incidents through the principal focus (in the case of a convex lens) [fig (E)] or directed towards the principal focus (in the case of concave lens) [fig (F)] after refraction through the lens becomes parallel to the principal axis.

Fig attached herewith...


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