Tyndall Beam Appears in Dilute Milk
Beam path is much more visible in milk.
Teaching & key ideas
What you do: Shine beam through both from side.
What students see: Beam path is much more visible in milk.
Why it works: Tiny suspended particles scatter light sideways into our eyes.
Question to ask: Why can we see the beam inside one liquid?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why can we see the beam inside one liquid?