(c) McGraw Hill Ryerson 2007 5.3 Using Lenses to Form Images A lens is a piece of transparent...
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Transcript of (c) McGraw Hill Ryerson 2007 5.3 Using Lenses to Form Images A lens is a piece of transparent...
![Page 1: (c) McGraw Hill Ryerson 2007 5.3 Using Lenses to Form Images A lens is a piece of transparent material that can bend, or refract, light rays in useful.](https://reader035.fdocuments.net/reader035/viewer/2022062421/56649cf95503460f949c9f99/html5/thumbnails/1.jpg)
(c) McGraw Hill Ryerson 2007
5.3 Using Lenses to Form Images
• A lens is a piece of transparent material that can bend, or refract, light rays in useful ways to help form a well-focused image.
• A lens can be concave or convex.
See page 190
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(c) McGraw Hill Ryerson 2007
Concave Lenses
• Concave lenses are thinner in the middle than at the edge.
• Concave lenses cause light rays to diverge.• Concave lenses produce images that are upright and smaller than the object.
• Concave lenses are sometimes used in eyeglasses and telescopes.
See page 191
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Concave Lenses
(c) McGraw Hill Ryerson 2007
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(c) McGraw Hill Ryerson 2007
Convex Lenses
• Convex lenses are thicker in the middle than at the edge.
• Convex lenses cause light rays to converge. When parallel rays strike a convex lens they come together at the focal point.
• A magnifying glass is a good example of a convex lens.
See page 192
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(c) McGraw Hill Ryerson 2007
Focal length in Convex Lenses
The distance from the centre of the lens to the focal point is called the focal length.
The type of image a convex lens forms depends on where the object is relative to the focal point.
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Focal Length in Convex Lenses
(c) McGraw Hill Ryerson 2007
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Focal Length in Convex Lenses
(c) McGraw Hill Ryerson 2007
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Focal Length in Convex Lenses
(c) McGraw Hill Ryerson 2007
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Focal Length in Convex Lenses
(c) McGraw Hill Ryerson 2007
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