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Geometric Optics vs. ‘the wave’. ‘plane’ traveling wave. ( Apple >> l ). A light ray: IN. Rough surface. A light ray: IN. Diffuse reflection:. A light ray: IN. Reflected light rays: OUT. Distinguishing Objects. Diffuse reflection. Diffuse reflection:. Diffuse reflection.

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Presentation Transcript
slide2

Geometric Optics vs. ‘the wave’

‘plane’ traveling wave

slide5

Rough surface

A light ray:

IN

Diffuse reflection:

slide6

A light ray:

IN

Reflected light rays:

OUT

slide7

Distinguishing Objects

Diffuse reflection

slide8

Diffuse reflection:

Diffuse reflection

slide9

No focusing:

Belly and nose undistinguishable!

slide10

Use a lens to ‘focus’:

Belly and nose distinguished !

slide11

Use a lens to ‘focus’:

Belly and nose distinguished !

slide12

How to focus divergent light rays?

Start: Use reflection off of smooth surfaces (mirrors) of special shapes.

Flat mirror

slide27

Where is F ?

  • must
  • be “small”!
slide28

Image ?

Object

slide29

Image ?

Object

slide30

Image ?

Object

slide31

Image ?

Object

Image

slide34

Image ?

Object

Image

slide35

Image ?

Object

Image

slide36

Image ?

Object

Image

slide38

For a concave mirror: InvertedReal Image

Convention: m < 0 for inverted image!

slide39

Example: A cute, baby chick is standing 10 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

slide40

Example: A cute, baby chick is standing 10 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

slide41

Example: Now, the cute, baby chick is standing 5 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

slide42

Example: Now, the cute, baby chick is standing 5 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

slide43

Example: Now, the cute, baby chick is standing 3 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

slide44

Example: Now, the cute, baby chick is standing 3 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

slide45

Example: Finally, the cute, baby chick is standing 1 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

DEMO

slide46

Example: Finally, the cute, baby chick is standing 1 ft in front of a concave mirror of radius 5 ft. Where is its image and how big?

“Virtual” image !

DEMO

slide50

‘Focal length’ ?

  • must
  • be small!
slide53

For a convex mirror: UprightVirtual Image

We can use the

same formulae

for a Concave mirror

If we use

Note di will always be negative:

slide54

Example: A cuter duck is standing 10 ft in front of a convex mirror of radius 5 ft. Where is its image and how big?

slide55

Example: A cuter duck is standing 10 ft in front of a convex mirror of radius 5 ft. Where is its image and how big?

Quack!

slide56

Mirror summary:

CONCAVE

CONVEX

So …

So …

Image

Object

Image virtual: di < 0

do > f

real, inverted

Image upright m > 0

virtual, upright

do < f