Waves

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Slide 30

LIGHT & ITS USES: Reflection Vocabulary

Enlarged –

Image is larger than actual object.

Reduced –

Image is smaller than object.

© 2000 Microsoft Clip Gallery

© 2000 Microsoft Clip Gallery

Slide 31

LIGHT & ITS USES: Reflection Vocabulary

Erect –

Image is right side up.

Inverted –

Image is upside down.

© 2000 Microsoft Clip Gallery

© 2000 Microsoft Clip Gallery

Slide 32

LIGHT & ITS USES: Reflection Vocabulary

Real Image –

Image is made from “real” light rays that converge at a real focal point so the image is REAL

Can be projected onto a screen because light actually passes through the point where the image appears

Always inverted

Slide 33

LIGHT & ITS USES: Reflection Vocabulary

Virtual Image–

“Not Real” because it cannot be projected

Image only seems to be there!

Slide 34

Light & Its Uses: Mirrors

Reflection Vocabulary

Optical Axis – Base line through the center of a mirror or lens

Focal Point – Point where reflected or refracted rays meet & image is formed

Focal Length – Distance between center of mirror/lens and focal point

© 2000 Microsoft Clip Gallery

Slide 35

LIGHT & ITS USES: Mirrors

Plane Mirrors – Perfectly flat

Virtual – Image is “Not Real” because it cannot be projected

Erect – Image is right side up

© 2000 Microsoft Clip Gallery

Slide 36

LIGHT & ITS USES: Mirrors

Reflection & Mirrors (Cont.)

Convex Mirror

Curves outward

Enlarges images.

Use: Rear view mirrors, store security…

CAUTION! Objects are closer than they appear!

© 2000 Microsoft Clip Gallery

Slide 37

LIGHT & ITS USES: Lenses

Convex Lenses

Thicker in the center than edges.

Lens that converges (brings together) light rays.

Forms real images and virtual images depending on position of the object

Slide 38

LIGHT & ITS USES: Lenses

Convex Lenses

Ray Tracing

Two rays usually define an image

Ray #1: Light ray comes from top of object; travels parallel to optic axis; bends thru focal point.

Focal Point

Lens