ray box investigations for reflection refraction and total internal reflection l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Ray Box Investigations For Reflection - Refraction and Total Internal Reflection PowerPoint Presentation
Download Presentation
Ray Box Investigations For Reflection - Refraction and Total Internal Reflection

Loading in 2 Seconds...

play fullscreen
1 / 41

Ray Box Investigations For Reflection - Refraction and Total Internal Reflection - PowerPoint PPT Presentation


  • 251 Views
  • Uploaded on

Ray Box Investigations For Reflection - Refraction and Total Internal Reflection. Created for CVCA Physics By Dick Heckathorn 1 June 2K + 5. #1. #2. 30 o. 30 o. 60 o. 60 o. #3. Rays 1-2-3. Conclusion. The angles are measured from the normal.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Ray Box Investigations For Reflection - Refraction and Total Internal Reflection' - Thomas


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
ray box investigations for reflection refraction and total internal reflection

Ray Box InvestigationsForReflection - RefractionandTotal Internal Reflection

Created for CVCA Physics

By

Dick Heckathorn

1 June 2K + 5

slide2

#1

#2

30o

30o

60o

60o

#3

Rays 1-2-3

conclusion
Conclusion

The angles are measured from the normal.

The angle of incidence equals the angle of reflection.

conclusion5
Conclusion

The angles are measured from the normal.

The angle of incidence equals the angle of refraction.

The incident ray, reflected ray and the normal all lie in the same plane.

slide6

Extend reflected rays behind mirror

Locate reflection surface of mirror on line.

Reflect ray of light from mirror as shown.

Insert a pin (1) on reflected light ray.

Draw a line from object to image

Mark and draw the light rays on paper

Insert pin into cardboard as shown.

Remove mirror

The image is located where the rays cross.

Draw a line across center of paper

Repeat for rays 3 and 4.

Insert pin (2) on ray and draw it.

Reflect a 2nd ray from mirror as shown

Repeat for other three occurrences

How is this line oriented relative to mirror line?

How does length of red and purple line compare?

Draw normal lines and compare angle ‘i’ and ‘r’

Image

Mirror

i

r

Pin

2

4

3

1

conclusion7
Conclusion

The image is always as far behind the reflecting surface (mirror) as the object is in front.

The line connecting the image and object is perpendicular to the reflecting surface (mirror).

slide8

Locate object.

Repeat for eye 2, 3, and 4

Draw line representing mirror.

Connect eye (1) and image

Draw line from object to mirror

Light travels this path from object to pin

Note angle ‘i’ equals angle ‘r’

Then draw line from mirror to eye 1

Locate image

Locate eye (1)

Why know where the image is?

Image

Mirror surface

r

i

Object

Pin

3

1

4

2

conclusion9
Conclusion

Locating the image allows one to predict the path light will travel from the object to some location.

slide10

I1,2

I1

Mirror (1)

I2

Object

Mirror (2)

slide11

Mirror (1)

Mirror (2)

I1,2

I2

I1

Object

periscope
Periscope

I1

Object

I1,2

slide13

Pepper Ghost

Bottle of Water

90o

Plexiglas

Candle

slide18

#19

V

P.A.

F

f

All rays parallel to P.A. reflect back through ‘F’

circular mirror
Circular Mirror

P.A.

Not all rays parallel to P.A. reflect back through ‘F’

slide23

N

#4

i

r

Measure angle i and angle r.

Both = 0o

slide24

#5

N

300

i

r

19.50

Calculate

Measure angle i and angle r.

slide25

N

#6

600

i

r

35.30

Calculate

Measure angle i and angle r.

slide26

for both angles,

Using

what value did you get?

It should be near 1.50

1.50 is called the index of refraction (nP) of the plastic.

slide27

N

Quiz

750

40.10

Calculate the angle of refraction.

Draw an incident ray of 75o.

Test your drawing with a light ray.

Draw the refracted ray.

slide28

N

#7

slide29

N

Calculate angle of refraction

Use light ray to check.

Bent away/toward normal?

Draw the refracted ray

30.90

30.90

200

#8

slide30

n1 sin θ1 = n2 sin θ2

It tells us which way the refracted ray bends.

Does it all!!!

What does it do?

How?

The bigger ‘n’ has the smaller ‘sin θ’ and thus the smaller ‘θ’ (angle).

slide31

N

Bent away/toward normal?

Calculate angle of refraction

Draw the refracted ray

Use light ray to check.

74.60

74.60

400

#9

slide32

N

Bent away/toward normal?

Use light ray to check.

Now what do we do?

Calculate angle of refraction

Tilt!!

600

600

#10

slide33

N

What happens here?

750

750

#11

slide35

Demonstrations

  • T.I.R. Plastic
  • T.I.R. Water
  • T.I.R. Glass Tube
  • Ball in/out of Water
  • Mugs
slide36

Demo – Aquarium Balls

Aquarium Balls

Air

Water

slide37

300

#12

Draw the refracted ray.

Calculate angle of refraction

Which way is ray bent?

n=1.50

19.50

Check with ray box.

Calculate angle of refraction

Which way is ray bent?

Draw the refracted ray.

300

slide38

#13

600

600

00

Calculate angle of refraction

Calculate angle of refraction

n=1.50

slide39

11.80

18.20

280

17.80

#15

11.80

18.20

280

17.80

#14

n=1.50

Calculate angle of refraction

Calculate angle of refraction

Calculate angle of refraction

Calculate angle of refraction