5 3 Lenses Using Lenses to Form Images

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5. 3 Lenses Using Lenses to Form Images

5. 3 Lenses Using Lenses to Form Images

Lenses • Lens is a curved piece of transparent material that refracts light. •

Lenses • Lens is a curved piece of transparent material that refracts light. • Light rays passed through a lens are either converged or diverged. • 2 types of lenses: – 1) Concave Lenses – 2) Convex Lenses

Concave Lenses • Concave lenses are thinner in the middle (thicker on the edges).

Concave Lenses • Concave lenses are thinner in the middle (thicker on the edges). • As rays of light shine through a concave lens, the rays diverge. Uses: used in some types of eyeglasses and some telescopes

Images Produced by Concave Lenses • Concave lenses are used to produce images that

Images Produced by Concave Lenses • Concave lenses are used to produce images that are upright and smaller compared to the real object.

Convex Lenses • Concave lenses are thicker in the middle (thinner on the edges).

Convex Lenses • Concave lenses are thicker in the middle (thinner on the edges). • Parallel light rays passing through a convex lens converge and meet at a focal point. Rays that strike the more curved surface of the lens bend more…

Images Produced By Convex Lenses • Images can be produced using convex lenses. •

Images Produced By Convex Lenses • Images can be produced using convex lenses. • For example, convex lenses are used in magnifying glasses, in overhead projectors and in cameras! • An image can be projected onto a screen using a light and a convex lens!

Focal Length • Focal length is just the distance from the center of the

Focal Length • Focal length is just the distance from the center of the lens to the focal point.

How Images Appear Depends on Focal Length • The image size and orientation depends

How Images Appear Depends on Focal Length • The image size and orientation depends how many ‘focal lengths’ away the object is from the lens.

Focal Length and Image • Relationship between the object’s distance from the lens and

Focal Length and Image • Relationship between the object’s distance from the lens and how the image appears: Distance from Lens - More than 2 focal lengths Image = smaller, upside down - B/w 1 and 2 focal lengths - At focal point - Less than 1 focal length = larger, upside down = no image = larger, right side up

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