Question

write down any two rules used for drawing Ray diagrams for the formation of image by convex lens .
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Answer 1

Explanation:

A line ray parallel to principal axis will appear to pass from focus

A ray passing from pole will go with the same angle (in other words will follo laws of reflection)

Answer 2

Explanation:

Rule 1 : when the incident ray is parallel to the principal axis, the refracted Ray passes through the principal focus.

Rule 2 : when the incident ray passes through the principal focus, the refracted ray is parallel to the principal axis.

Rule 3 : when the incident ray passes through the optical Centre of the lens, it passes without changing its direction.