LED Tower
Purpose
A vertical array of eleven labeled LEDs spanning the visible spectrum (400–640 nm plus white) provides a concrete reference for wavelength-color relationships. Used with a diffraction grating, students can verify the grating equation by measuring diffraction angles for known wavelengths.
Figure 1:
The LED tower operating in darkness with a diffraction grating placed in front, producing first-order diffraction patterns for each wavelength. The horizontal spectral lines demonstrate wavelength-dependent diffraction angles.
Figure 2:
The LED array tower with labeled wavelengths for each color, allowing students to directly correlate electromagnetic wavelength values with perceived color in the visible spectrum.
Equipment
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