A Glass Refraction Demonstration Series

In this short video series, pro-technician Paul Cook shows you a range of quick refraction demonstrations with glass tubes and a beaker of glycerine.

Ideal for GCSE students, this refraction demonstration shows how the glass and the glycerine have the same refractive index.

Why does glass disappear in glycerine?

This is because light travels through glass and glycerine at the same speed, so your eyes don’t see a boundary where the tube is, rendering it invisible.

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