Prism Power Lab Worksheet Prism Power Lab
Investigation 01: Refraction & Dispersion
NAME: ________________________________
DATE: __________________
THE BROKEN PENCIL
Place a pencil into a half-filled glass of water. Look at it from the side. Why does the pencil appear to be "broken" or disjointed at the water's surface?
Lab Objectives
Measure angles of incidence and refraction.
Observe the dispersion of white light.
Calculate refractive index trends.
1
Measuring Refraction
Using a semi-circular glass block and a laser pointer, measure the angle of refraction (\(\theta_r\)) for various angles of incidence (\(\theta_i\)).
Medium A (Air) \(\theta_i\) Medium B (Glass) \(\theta_r\) Observations (Direction of bend) \(15^\circ\) \(30^\circ\) \(45^\circ\) \(60^\circ\)
Analysis Question:
As the light moves from air (less dense) into glass (more dense), did it bend toward or away from the normal line?
2
The Color Explosion
Shine a high-intensity white light through a triangular glass prism. Adjust the angle until a spectrum appears on the white screen.
Sketch Your Results:
DRAW PRISM & SPECTRUM HERE
Color Order (Top to Bottom):
1. ______________________
2. ______________________
3. ______________________
4. ______________________
5. ______________________
6. ______________________
7. ______________________
Synthesize Your Findings
1. Why does white light split into different colors when it hits the prism?
2. Which color bent the MOST? Which bent the LEAST? (Hint: Think about energy and wavelength).
Light & Optics Sequence Lesson 01: Refraction & Dispersion Physics Grade 9
Light Benders Slides Bending the Beam
Investigation into Refraction & Dispersion
The Mystery
Why does a pencil appear broken when placed in water?
"Is it the pencil that changes, or the light itself?"
✏️💧
What is Refraction?
The bending of light as it passes from one medium to another.
Caused by a change in light's speed.
Water
Air
Ray Diagram
The Rules of the Bend
Toward the Normal
When light enters a more dense medium (Air → Glass).
Slows Down
Away from Normal
When light enters a less dense medium (Glass → Air).
Speeds Up
Dispersion: Splitting Light
White light is actually a mixture of all visible frequencies.
Different colors travel at slightly different speeds in glass, causing them to refract at different angles.
R O Y G B I V
🌈
The Rainbow Effect
Mission: Prism Power
Lab Time
01
Set Up
Place semi-circular block on the protractor center. Turn off room lights.
02
Measure
Aim laser at 15°, 30°, 45°, 60°. Record refracted angles.
03
Analyze
Compare white light vs. single laser. Sketch the dispersion.
Spectrum Secrets Slides Spectrum Secrets
Absorption & Reflection
Light Check
Imagine a bright red apple.
You take it into a darkroom lit only by a pure green light.
What color is the apple now?
🍎
Wait for it...
How We See Color
Reflection
The wavelengths of light that bounce off an object and enter our eyes.
Absorption
The wavelengths that are trapped by the object and turned into heat energy.
🍎
White Light (Incoming)
Red Light (Reflected)
The Filter Trap
A filter works by only letting specific wavelengths pass through.
A red filter subtracts (absorbs) green and blue light, while letting red light through.
White Light
RED
Blue Light
BLACK
Two Ways to Mix
Additive (Light)
Mixing lights together to reach White.
Red Green Blue
Used in: TVs, Phones
Subtractive (Pigment)
Subtracting light to reach Black.
Cyan Magenta Yellow
Used in: Printing, Paint
Mission: Color Workshop
Active Investigation
1
Use RGB flashlights to create Secondary Colors on a white screen.
2
Layer colored filters to predict and observe the resulting Shadow Color.
Color Mixer Workshop Worksheet Color Mixer Workshop
Investigation 02: Light & Pigment Physics
NAME: ________________________________
LAB GROUP: ________________________
Part 1: The Primary Beam
Using Red, Green, and Blue (RGB) flashlights, overlap the beams on a white surface. Record the colors created in the overlap zones.
Light Combination Resulting Color Red + Green Red + Blue Green + Blue Red + Green + Blue
Sketch the Overlap (Venn Diagram)
Part 2: Selective Subtraction
Look at a white light source through different filter combinations. Predict the result, then observe.
Filter Combination Prediction Observation Why? (What was absorbed?) Magenta + Yellow Cyan + Yellow Cyan + Magenta
ANALYSIS CHALLENGE
"Stage lights often use RGB LEDs. To make a pure white stage wash, you turn all three to max intensity. To make the stage look 'cool' and blue-tinted, which lights would you dim or turn off?"
The Reflection Rule
A Blue Shirt appears blue because it reflects __________________ wavelengths and absorbs __________________ and __________________ wavelengths.
Physics Core Principle 02
Chameleon Challenge Exit Ticket Chameleon Challenge
Exit Ticket: Lesson 02
NAME: ________________
DATE: ________________
1. You have a "Chameleon" toy that is painted with a pigment that reflects ONLY green light. If you shine a pure RED light on it in a pitch-black room, what color will the toy appear?
Red
Green
Yellow
Black
2. Why does a white object appear white under white light? (Mention reflection and absorption in your answer).
3. Color Mixing Check: What light color is created when Red and Blue light beams overlap?
Answer: ________________________________
Star Fingerprints Slides Star Fingerprints
Spectroscopy & Element Identification
Cosmic Detective
"How do we know what stars are made of without ever visiting them?"
The answer isn't in the telescope itself... it's in the light.
Light is a data stream.
🌟
The Diffraction Grating
A tool with thousands of microscopic slits per millimeter.
It separates light into its component colors.
Unlike a prism, it uses interference.
Grid Pattern
Spectral Splitter
The Fingerprint: Emission Spectra
When elements are energized, they emit specific, discrete wavelengths of light.
Every element has a unique set of spectral lines—just like a human fingerprint.
Hydrogen Spectrum
Helium Spectrum
The Quantum Connection
Electron Jumps
Electrons drop from high energy shells to lower shells.
Photon Release
The energy lost is released as a Photon (light particle) of a very specific color.
Energy = Color
Mission: Spectral ID
Skill-Building
STEP 1
Observe mystery gas tubes through your diffraction grating.
STEP 2
Sketch the Exact Placement of the color lines.
STEP 3
Match your sketch to the Element Reference Card.
Atomic Architect Lab Worksheet Atomic Architect Lab
Emission Spectroscopy & identification
NAME: ________________________________
STATION #: ___________
PROCEDURE
Peer through the diffraction grating at the energized gas tube.
Locate the first-order spectrum to the left or right of the source.
Carefully map the spectral lines on the grids below. Use colored pencils to match the exact hues you see.
Compare your observed "fingerprint" to the Spectral Signature Reference Card to identify the element.
SAFETY WARNING
Gas tubes use high-voltage power supplies. DO NOT TOUCH the electrodes or the glass tubes while the power is ON.
Gas Tube Alpha (Unknown)
400nm ————————— 700nm
Observation Notes:
Identity Prediction:
________________
Gas Tube Beta (Unknown)
400nm ————————— 700nm
Observation Notes:
Identity Prediction:
________________
Gas Tube Gamma (Unknown)
400nm ————————— 700nm
Observation Notes:
Identity Prediction:
________________
Post-Lab Analysis
1. Why does the gas tube appear to be one solid color (like pinkish-red for Hydrogen) to the naked eye, even though it contains multiple spectral lines?
2. If you observed a star and saw the Hydrogen spectrum but shifted slightly toward the red end of the scale, what might that tell you about the star's movement?
Quantum Physics Unit Lesson 03: Spectroscopy Property of light lab facility
Spectral Signature Reference Card Spectral Signature Card
Atomic Emission Reference Key / Lab Aid 03
01 HYDROGEN (H)
ATOMIC #1
Note: Features a prominent bright red line and distinctive blue-violet lines.
02 HELIUM (He)
ATOMIC #2
Note: Identified by its sharp, brilliant yellow emission line.
03 NEON (Ne)
ATOMIC #10
Note: Densely packed lines in the orange and red regions of the spectrum.
04 MERCURY (Hg)
ATOMIC #80
Note: Features very strong, isolated lines in violet, green, and yellow.
UV End (Short \(\lambda\))
IR End (Long \(\lambda\))
Spectrum Master Lab Resource
Focus Finder Slides Focus Finders
Optics & Image Formation
Magnification Magic
"How can a simple piece of curved glass make a tiny bacteria look like a monster, or a distant planet look like it's right in front of you?"
It's all about converging and diverging light rays.
🔍
The Convex Lens
Converging Lens
Thicker in the middle than at the edges. It brings light rays together.
Creates Focal Points.
FOCAL POINT (F)
Real Image Focus
The Concave Lens
Diverging Lens
Thinner in the middle. It spreads light rays apart.
Always produces Virtual Images (smaller and upright).
Light Scatterer
Image Types
Real Image
Can be projected onto a screen.
Light rays actually meet.
Usually INVERTED (upside down).
Virtual Image
Cannot be projected on a screen.
Rays appear to come from a point.
Usually UPRIGHT.
Mission: Ray Tracer
Skill-Building
Ray tracing is a geometric tool used to predict where an image will form.
"If you know where the rays go, you know where the image is."
Ray 1: Parallel to Axis
Ray 2: Through Center
Intersection = Image
Ray Tracer Worksheet Ray Tracer Worksheet
Skill-Building: Geometric Optics
NAME: ________________________________
GEOMETRY OF LIGHT / UNIT 04
The 2-Ray Rule
Ray 1: Parallel to the principal axis, then through the focal point (F).
Ray 2: Straight through the optical center of the lens (no bending).
1
Convex Lens: Object Beyond 2F
2F
F
F
2F
Orientation: ________________
Size: ________________
Type: ________________
2
Convex Lens: Object Between F and Lens
F
F
Orientation: ________________
Size: ________________
Type: ________________
3
Concave Lens: Any Position
F
F
Orientation: ________________
Size: ________________
Type: ________________
Lenses & Optics Sequence Lesson 04: Focus Finders
Optics Answer Key Teacher Resource: Answer Key
Material: Ray Tracer Worksheet
Lesson 04
Focus Finders
1. Convex Lens: Beyond 2F
Orientation: Inverted
Size: Reduced (Smaller)
Type: Real Image
Location: Between F and 2F on the opposite side.
2. Convex Lens: Between F and Lens
Orientation: Upright
Size: Magnified (Larger)
Type: Virtual Image
Example: Magnifying glass use case.
3. Concave Lens
Orientation: Upright
Size: Reduced (Smaller)
Type: Virtual Image
Concave lenses always produce virtual, upright, and smaller images.
Official Instructional Key — For Educator Use Only
Bio Optics Slides The Seeing Eye
The Physics of Vision
Biological Lens
"Your eye is a complex optical instrument, more advanced than any camera."
How does your brain turn Electromagnetic Waves into the Color and Depth you see?
👁️
The Eye as a System
1. Cornea & Lens
Acting as a Convex Lens, they focus incoming light.
2. Retina
The "screen" at the back of the eye where the Real Image is projected.
3. Optic Nerve
The data cable that sends electrical signals to the brain.
RETINA
Upside Down Reality
The Sensors: Photoreceptors
Cones
Handle Color and fine detail. Three types: Red, Green, and Blue.
Work best in bright light.
Rods
Handle Light Intensity and motion.
Work best in low light.
When Sensors Fail
Colorblindness occurs when one or more types of Cones are missing or malfunctioning.
Ishihara Test
If your red cones don't respond to 650nm light, certain numbers hidden in dots become invisible.
12
NORMAL VISION DEUTERANOPIA
Mission: Eye Health
Synthesis
Corrective Optics
Nearsightedness: Eye is too long. Corrected with Concave lenses.
Farsightedness: Eye is too short. Corrected with Convex lenses.
"We don't see with our eyes; we see with our brains. The eye is just the first lens."
Sight Science Case Study Worksheet Sight Science Case Study
Physics of Perception / Investigation 05
NAME: ________________________________
Biological Systems Laboratory
Part 1: The Ishihara Investigation
The Ishihara test uses circles of multicolored dots to screen for red-green color deficiencies. If an individual lacks a specific cone type, they cannot distinguish between hues that appear distinct to a person with normal vision.
Technical Analysis:
"Why would a student with Red Cone deficiency see a '6' as an '8' in a specific Ishihara plate?"
Spectral Responsivity
<table class="w-full text-[10px] uppercase font-mono"><tbody><tr class="border-b border-slate-800"><td class="py-2 text-rose-400">S-Cone (Blue)</td><td class="py-2 text-right">~420nm</td></tr><tr class="border-b border-slate-800"><td class="py-2 text-emerald-400">M-Cone (Green)</td><td class="py-2 text-right">~530nm</td></tr><tr><td class="py-2 text-rose-600">L-Cone (Red)</td><td class="py-2 text-right">~560nm</td></tr></tbody></table>
If L-Cones are missing, light at 560nm is interpreted by the M-Cone, causing "Green" and "Red" to merge.
Part 2: The Optics of Correction
Case A: Myopia
NEARSIGHTED
The eyeball is too long, causing light to focus in front of the retina.
Required Lens Type:
Sketch Lens Shape
Scientific Explanation:
Case B: Hyperopia
FARSIGHTED
The eyeball is too short, causing light to focus behind the retina.
Required Lens Type:
Sketch Lens Shape
Scientific Explanation:
Synthesis Question
As humans age, the biological lens of the eye becomes less flexible. This makes it harder for the eye to change its focal length (a process called accommodation ). Explain why older adults often need "reading glasses" (Convex lenses) for up-close work, even if they had perfect vision as children.
Light & Optics Final Unit Lesson 05: The Seeing Eye
Light Master Quiz Worksheet Light Master Quiz
Unit 04: Visible Light & Optics
STUDENT: ___________________________________
SCORE: ______ / 50
PART 1 Bending Beams
1. When light moves from a less dense medium (Air) into a more dense medium (Glass), it always:
A. Speeds up and bends toward the normal.
B. Slows down and bends toward the normal.
C. Speeds up and bends away from the normal.
D. Slows down and bends away from the normal.
2. Explain why a prism produces a rainbow from white light.
PART 2 Spectrum Secrets
3. Match the mixing type to the correct description:
A. Additive Mixing Mixing Light
B. Subtractive Mixing Mixing Pigment
1. _______ Results in White light; uses RGB primaries.
2. _______ Results in Black; uses CMY primaries.
4. A green leaf looks green because it ___________ green light and ___________ all other colors.
Word 1: __________________
Word 2: __________________
PART 3 Atomic Prints
5. Why do different elements have different spectral lines?
Spectral ID Challenge
Identify the element based on these major lines: 656nm (Red), 486nm (Cyan), and 434nm (Blue).
ANSWER: ______________________
PART 4 Focus & Lenses
6. Sketch a CONCAVE lens and show what happens to parallel light rays.
Draw Diagram Here
7. Which image type can be projected onto a screen?
A. Real Image
B. Virtual Image
PART 5 The Human Eye
8. A person is diagnosed with Hyperopia (farsightedness). Their eye focuses images behind the retina.
Which lens type is needed for correction?
ANSWER: ______________________
9. Explain the role of CONES in the retina.
Bonus +5 pts
The Speed of Light
What is the approximate speed of light in a vacuum, and why does this speed change when light enters water?
Light & Optics Final Assessment Physics Grade 9 Form A-1
