Lenses Lenses are curved surfaces that refract light as it passes through. [http://www.ast.cam.ac.uk/~optics/dazle/photos/finished_lenses/lenses_1_to_4_1.jpg]

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Presentation transcript:

Lenses Lenses are curved surfaces that refract light as it passes through. [

Convex Lenses Thicker in the middle than at the edges Bends light toward the middle. (Focal Point!) [

Can correct farsightedness. [

Convex Lenses Can be used to create magnified virtual images. Object must be less than 1 focal length away [

Convex Lens Ray Diagram Object Distance < 1 focal length away from lens Virtual Image: Magnified & Upright

Convex Lenses Can create real images if the object is > 1 focal length away. [ ObjectReal Image Click for Images Demonstration

Convex Lens Ray Diagram Object Distance > 1 focal length away from lens Real Image: Upside Down (But Size Varies!)

Concave Lenses Thicker on the edges than they are in the middle. Bends light outward (no focal point!) [

Can correct nearsightedness. [

Concave Lenses Creates only a smaller virtual image. [

Concave Lens Ray Diagram Object Located Anywhere Virtual Image: Smaller & Upright