# Why are images formed?

How do rays of light getting focused at a point create an image?

How are the information of object's shape and dimensions expressed as an image when light rays converge?

Is it understandable by solving wave equation for light?

• "Is it understandable by solving wave equation for light?" What do you mean by wave equation? – Yashas Feb 24 '17 at 15:31
• -1. No research effort. – sammy gerbil Feb 25 '17 at 4:14

A set of rays focusing at one point form an image of only one point. For example, the red incident rays originating from the point $A$ of the object meet at $A'$ on the image side. The red rays originate from a point and form an image of just one point. Similarly, the yellow and the blue rays form the images of their corresponding points.