Science activity
Light and Shadow Lab
Play with flashlights and discover shadows! Find out what makes shadows and put on a shadow puppet show using your hands and cutout shapes.
Materials and setup
- flashlight
- various objects (clear cup, block, tissue paper, wax paper)
- cardboard
- scissors
- white paper
- tape
- small mirrors
- magnifying glass
- glass of water
How this changes by age
Pre-K (ages 3–4)
Play with flashlights and discover shadows! Find out what makes shadows and put on a shadow puppet show using your hands and cutout shapes.
Steps
- Darken a room and turn on a flashlight. Shine it at the wall.
- Put your hand between the flashlight and wall. 'Look, a shadow! Your hand is blocking the light!'
- Try making shadow puppets with your hands: bunny, dog, bird.
- Gather objects: clear cup, wooden block, tissue paper. Shine the flashlight through each one.
- Sort objects into groups: 'Light goes through' (clear cup), 'Some light goes through' (tissue paper), 'No light goes through' (block).
- Tell a grown-up one thing that surprised you.
Learning objectives
- Understand that shadows form when objects block light
- Observe that some materials let light through and others do not
- Create shadow shapes using hands and objects
Kindergarten (ages 5–6)
Explore how light interacts with different materials: transparent, translucent, and opaque. Build a shadow puppet theater and discover how distance changes shadow size.
Steps
- Learn three words: transparent (light goes through clearly — glass), translucent (some light — wax paper), opaque (no light — cardboard).
- Test 10 objects with a flashlight: sort each into transparent, translucent, or opaque. Record in a chart.
- Discover shadow size: hold an object close to the flashlight (big shadow) then far away (small shadow). Why does this happen?
- Build a shadow puppet theater: cut a rectangle from a cardboard box, tape white paper over the opening.
- Create puppet characters from cardboard on sticks. Perform a short shadow puppet story!
- Experiment: what happens when you use colored cellophane in front of the flashlight? Color shadows!
- Tell a grown-up one thing that surprised you.
Learning objectives
- Classify materials as transparent, translucent, or opaque
- Discover how distance between object and light source affects shadow size
- Build and use a shadow puppet theater to demonstrate light behavior
Early elementary (ages 6–8)
Investigate light behavior: reflection, refraction, and absorption. Build devices that use light properties and conduct experiments measuring how light travels.
Steps
- Demonstrate that light travels in straight lines: poke a hole in 3 index cards, line them up, and shine a flashlight through. The light only goes through when all holes are aligned.
- Explore reflection: shine a flashlight at a mirror. Measure the angle of incoming light and reflected light. Are they equal? Test with different angles.
- Explore refraction: put a pencil in a glass of water. Why does it look bent? Shine a flashlight through water at an angle — observe how the beam bends.
- Explore absorption: shine a flashlight on white paper vs black paper. Feel both after 5 minutes — which is warmer? Dark colors absorb more light energy.
- Build a periscope using a milk carton and two small mirrors: cut holes at opposite ends, position mirrors at 45 degrees to bounce light around a corner.
- Write a lab report covering your experiments on reflection, refraction, and absorption. Include diagrams showing how light behaves in each case.
Learning objectives
- Demonstrate that light travels in straight lines through experiments
- Explain reflection, refraction, and absorption with examples
- Build an optical device that applies the principle of light reflection
Upper elementary (ages 8–10)
Conduct an in-depth optics investigation: explore the electromagnetic spectrum, experiment with lenses and prisms, study how the human eye works, and build optical instruments.
Steps
- Research the electromagnetic spectrum: visible light is just one small part. List all types from radio waves to gamma rays, their wavelengths, and everyday uses.
- Split white light into a rainbow using a prism (or a glass of water in sunlight). Identify the colors in order (ROYGBIV). Explain why white light separates into colors.
- Experiment with lenses: use a magnifying glass to focus sunlight onto paper (adult supervision required). Explain how convex lenses converge light and concave lenses diverge it.
- Research how the human eye works: cornea, iris, pupil, lens, retina, optic nerve. Draw a cross-section diagram. Explain how nearsightedness and farsightedness work and how glasses correct them.
- Build a simple telescope or camera obscura: (telescope) two magnifying glasses in a cardboard tube at the right distance apart, or (camera obscura) a box with a pinhole that projects an upside-down image.
- Write a comprehensive optics report covering: the electromagnetic spectrum, light behavior (reflection, refraction, absorption), how lenses work, eye anatomy, and your optical instrument build.
Learning objectives
- Describe the electromagnetic spectrum and where visible light fits within it
- Explain how lenses focus light and how the human eye forms images
- Build and explain the principles behind an optical instrument
Safety and evidence note
Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.
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