How does vision work?

Ages

Introduction

Summary

To see, enough light must go into the eye.
In general, light propagates from the source to the object and then from the object to the eye. The objects that are seen in this way are secondary sources. In contrast, the light bulb that illuminates the scene is a primary source.

Goals

• To apply the linear ray model of light.
• To understand that light has to enter the eye, and that the object being observed must itself be receiving sufficient light from a primary source.
• To show that the eyes are only light  receptors. The brain is the interpreter that enables vision to occur.
• To show that light is everywhere around us. Only the tiny part of it penetrating our eyes participates in  vision.

Features

Rollover the head of the baby to highlight the eye and the brain, both involved in the vision process.

Tags

vision ray light eye source Alhazen