Flashlight Beam Diffraction & Shadow Tinting

20 mins Ages 4-6 Indoor

A playful, screen-free adventure designed to spark curiosity, sensory exploration, and fine motor skills for kids aged 4 to 6.

Materials Needed

  • • Pocket flashlights (3 units)
  • • Colored cellophane sheets (Red, Green, Blue) (3 pieces)
  • • Rubber bands (3 units)
  • • Blank white wall or white sheet (1 surface)

Pro Tips

  • → Wrap one flashlight with red cellophane, one with green, and one with blue.
  • → Aim all three colored beams at the exact same spot on a white wall in a dark room: the combined colors produce white light.
  • → Place your hand in front of the combined beams to cast shadows tinted in cyan, magenta, and yellow.

Safety First

Do not shine bright flashlights directly into eyes.

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Step-by-Step Instructions

1

Step 1

Cover the lenses of 3 pocket flashlights with red, green, and blue cellophane, securing with rubber bands.

2

Step 2

Turn off room lights and aim all three colored beams to overlap on an empty white wall.

3

Step 3

Adjust the flashlight distances until the central overlapping pool blends into bright white light.

4

Step 4

Hold your hand in front of the beam and wave your fingers to cast three overlapping shadows in cyan, magenta, and yellow.

What they are learning

Additive light color mixing (RGB) Colored shadow formation Optical focal projection