TAKE NOTES ON THE FOLLOWING INFORMATION. IF ASKED, PLEASE DRAW ANY KEY DIAGRAMS.

• A LENS IS ANY OBJECT THAT ALLOWS LIGHT TO PASS AND REFRACTS LIGHT.

• REFRACT = TO CHANGE THE DIRECTION OR BEND.

WHAT DO LENSES DO?

WHY DOES REFRACTION OCCUR?

REFRACTION OCCURS WHEN LIGHT PASSES FROM ONE DENSITY OF MEDIUM TO ANOTHER DENSITY OF MEDIUM.

EACH MEDIUM ALLOWS LIGHT TRAVEL AT A CONSTANT SPEED. WHEN LIGHT CHANGES SPEED, IT REFRACTS.

• CONVERGING LENSES

• DIVERGING LENSES

THERE ARE TWO BASIC SHAPES FOR LENSES.

• WE USE LENSES TO HELP OUR EYES REFOCUS LIGHT FOR BETTER VISION.

• GENERALLY, WE SAY THAT LENSES BROADEN OUR FIELD OF VISION.

WHY DO WE USE LENSES?

• CREATE UPSIDE DOWN IMAGES.

• ALLOW LIGHT TO COME TOGETHER.

• CURVATURE DETERMINES THE DISTANCE AT WHICH LIGHT FOCUSES.

CONVERGING LENSES

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• MAKES LIGHT SPREAD OUT.

• LIGHT NEVER FOCUSES BEYOND THE LENS.

DIVERGING LENSES

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