Quick Answer: The Electric Newton’s Disk is a motorised disc printed with multi-colour visible spectrum sectors. When it spins, the colours blend and the disc looks nearly white, showing that white light is made of spectrum colours.
Last updated: October 2026
Key Features
Motorised rotation for a steady colour-mixing demonstration
Disc with multi-colour visible spectrum sectors
Shows colours recombining to a near-white appearance
Demonstrates persistence of vision
Technical Specifications
Specification
Value
Operation
Electric / motorised rotation
Disc pattern
Multi-colour visible spectrum sectors on a circular rotating disc
Learning concepts
White light composition, visible spectrum, colour mixing, persistence of vision
About This Product
Electric drive keeps the speed steadier than a hand-turned disc, so the whole class sees the same near-white effect. Comparing the stopped coloured sectors with the spinning disc explains the composition of white light and how the eye briefly retains each colour.
Frequently Asked Questions
Why does the spinning disc look nearly white?
The eye retains each visual impression briefly, so the rapidly changing spectrum colours blend together and appear nearly white.
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