Question

explain rules to draw a ray diagram

Answer 1

one of the main rule is that a ray has one end point so it has to look like a half line segment and half line and it shouldnt extend in both the directions but one.

Answer 2

1) as object moves toward the focal point:

image gets biggerimage gets further away on the other side of the lensimage is always real and inverted

2) at focal point, no image

3) if object between focal point and lens --

image is always bigger than objectBUT as the object moves closer to the lens, the image gets smallerimage is always virtual and upright

diverging lens

image always smaller than objectas object moves closer to the lens, image gets bigger (but still smaller than the object)image always on the same side as the object