Course: Science Subtest I
Lesson: Optics and Waves
Topic: How We See      Page 12 of 27  

Our view of an object is along a line of sight. The line of sight is the straight line from our eye (or eyes) to the object. Actually, we don't see a single ray, but a bundle of rays forming a thin cone.  The pupil in the eye can capture a small bundle of light rays emanating from a glowing object in slightly different directions.

Light emanates from a candle flame in all directions. When we look at the flame, we are looking along a line of sight. The rays in a small cone around that line enter the eye.