Nearsightedness

Two converging lenese are combined to simulate a short focal length eye. On the lecture table, the image of a light bulb is projected through the combined lenses onto a nearby screen to show sharp focus for a nearsighted eye. Next, the light bulb is moved farther from the combined lenses to blur the image and simulate nearsightedness. A diverging lens is placed in front of the combined lenses which brings the image again into focus, thereby correcting the nearsightedness.
Equipment:
Two converging lenses
Diverging lens
Light source
Small screen
Stands for lenses and screen
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This video is part of the project "Videos of Physics Demonstrations", which is created by Dr. Galli and Dr. Amiri of Physics Department, Weber State University. To access the full library of the videos, please visit this link: www.weber.edu/...
Links to University and Department:
Weber State University Homepage: www.weber.edu/
WSU Physics Department: www.weber.edu/...