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2000 D. L. Power

Slide 39

LIGHT & ITS USES: Lenses

LIGHT & ITS USES: Lenses

Convex Lenses

Ray Tracing

Two rays define an image

Ray 2: Light ray comes from top of object & travels through center of lens.

Ray #1

Ray #2

2000 D. L. Power

Slide 40

LIGHT & ITS USES: Lenses

LIGHT & ITS USES: Lenses

Concave Lenses

Lens that is thicker at the edges and thinner in the center.

Diverges light rays

All images are erect and reduced.

2000 D. L. Power

Slide 41

How You See

How You See

Near Sighted Eyeball is too long and image focuses in front of the retina

Far Sighted Eyeball is too short so image is focused behind the retina.

2000 Microsoft Clip Gallery

2000 Microsoft Clip Gallery

Slide 42

Light & uses: Lenses

Light & uses: Lenses

Concave Lenses

Vision Eye is a convex lens.

Nearsightedness Concave lenses expand focal lengths

Farsightedness Convex lenses shortens the focal length.

Slide 43

Light & uses: Optical Instruments

Light & uses: Optical Instruments

Cameras

Telescopes

Microscopes

2000 Microsoft Clip Gallery

2000 Microsoft Clip Gallery

2000 Microsoft Clip Gallery

Slide 44

LIGHT & USES: Optical Instruments

LIGHT & USES: Optical Instruments

LASERS

Acronym: Light Amplification by Stimulated Emission of Radiation

Coherent Light Waves are in phase so it is VERY powerful & VERY intense.

Slide 45

LIGHT & USES: Optical Instruments

LIGHT & USES: Optical Instruments

LASERS

Holography Use of Lasers to create 3-D images

Fiber Optics Light energy transferred through long, flexible fibers of glass/plastic

Uses Communications, medicine, t.v. transmission, data processing.

Slide 46

Light & uses: Diffraction

Light & uses: Diffraction

Diffraction Bending of waves around the edge of a barrier. New waves are formed from the original. breaks images into bands of light & dark and colors.

Refraction Bending of waves due to a change in speed through an object.

Slide 47

LIGHT & USES: Diffraction

LIGHT & USES: Diffraction

A diffraction grating. Each space between the ruled grooves acts as a slit. The light bends around the edges and gets refracted.

2000 Microsoft Encarta

Slide 48

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