# 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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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]

Convex Lenses Thicker in the middle than at the edges Bends light toward the middle. (Focal Point!) [http://www.bbc.co.uk/scotland/education/bitesize/standard/img/physics/waves/convex_lens.gif]

Can correct farsightedness. [http://www.schools.net.au/edu/lesson_ideas/optics/images/optic_hyperopia.gif]

Convex Lenses Can be used to create magnified virtual images. Object must be less than 1 focal length away [http://sol.sci.uop.edu/~jfalward/physics17/chapter12/magnifier2.jpg]

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. [http://gpc.edu/~pgore/PhysicalScience/ray_diagram_sample.jpg] 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!) [http://www.bbc.co.uk/scotland/education/bitesize/standard/img/physics/waves/convex_lens.gif]

Can correct nearsightedness. [http://www.schools.net.au/edu/lesson_ideas/optics/images/optic_hyperopia.gif]

Concave Lenses Creates only a smaller virtual image. [http://sol.sci.uop.edu/~jfalward/physics17/chapter12/magnifier2.jpg]

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

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