NEW GROUPS

Group 1:Sarah HutchinsonWill EdwardsRamsey CarpenterValerie Jenkins

Group 2:Kerri PrichardSara MitchellJames MooreHeather Blake

Group 3:Brittany LaneLaura UsreyJordon WorleyMary Emma Darst

Group 4:Aby VelaMeghan ErenaEmily DuncanKaitlyn Sanford

Group 5:Chelsey HarringtonSara LandwehrLauren CracraftLindsay Caudill

Group 6:Leah RobinsonCaitlin AnthonyPreslee MortensonLayne Halliburton

Group 7:Holly HardwickEmily MontgomeryStephanie DauweBrittany Sabo

Group 8:Audrey SimpsonPaige BlairKatelyn HoskinsDanielle Krohn

Group 9:Mercedes DavisKierstyn StanleyBailey UbellackerJoshua Doss

- Discuss and review how light travels and how it interacts with matter

- Investigate how diffuse and specular reflection determines what we can see

- Study the behavior of light sources through different openings and construct a pinhole camera

TODAY’S OUTCOMES:BEHAVIOR OF LIGHT

13. Set up the light station so that it illuminates the screen. Predict what you will observe when you place the mask over the aperture (with the hole positioned so that light can go through it).

14. Then try the experiment. What do you observe?

Most predicted a small spot, just as was observed with the two smalllight bulbs.

Answers may vary, according to the positioning of the mask and light box.

A pattern resembling a “blurry V” or a “heart” appeared on the screen.

15. Repeat activity 13-14, using a mask with a very small hole in it. What do you observe?

A much sharper pattern appeared, resembling a “V”, this time with a muchsharper definition.

16. Explain the shapes seen on the screen in activities 14 and 15. A hint: look at the filament of the light station light bulb, using the “filament viewer” (a disk of translucent plastic).

Using the “filament viewer”, one can see that the filament has a shape ofan inverted “V”. Thus, the source of the light is not a small point, but ratheran source with some shape.

This principle will be investigated further in today’s activity!

The source of light doesn’t matter - it always travels in a straight line!

LIGHT TRAVELS IN STRAIGHT LINES

laser

laser

This is obvious with a laser

The source of light doesn’t matter - it always travels in a straight line!

LIGHT TRAVELS IN STRAIGHT LINES

Not as obvious with a light bulb - light is emittedin ALL directions

mask limits light to a narrow beam

small light bulb

The size of the spot on the screen depended on the distances

LIGHT TRAVELS IN STRAIGHT LINES

light bulb gets closer,spot on the screen grows

larger

Is this consistent withthe observation thatlight beams follow

straight lines?

YES

Small light bulb vs. large light bulb -how were they different?

DIFFERENT LIGHT BULBS

vs.

In the small bulb, the light given off in a particular

direction comes from a very small “point”

In a large bulb, the light in a particular direction comes

from every possible point on the filament

KEEP THIS IN MIND AS YOU DO TODAY’S ACTIVITY!

You reviewed some new operational terms:INTERACTION OF LIGHT WITH MATTER

Transparent: light passes through “unaffected”, as a beam

Translucent: light passes through, but is dimmer and scattered in many directions

Opaque: light cannot pass through

THINK: Were some of the materials you looked at difficult to classify? Were any truly

transparent or opaque?

- Light travels in a straight line (and observations that demonstrate this fact!)

- Definitions: - transparency - translucence - opacity - absorption - reflection

WHAT YOU ARE EXPECTED TO KNOW:

- Discuss and review how light travels and how it interacts with matter✓

- Investigate how diffuse and specular reflection determines what we can see

- Study the behavior of light sources through different openings and construct a pinhole camera

TODAY’S OUTCOMES:BEHAVIOR OF LIGHT