This colour of visible light has the shortest wavelength.

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Your new ahaViolet

Violet lies toward the short-wavelength end of the visible spectrum. Source: Violet (color) ↗

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44This thicker-centred lens converges parallel rays of light in air.RECALL
Convex lens
It is thicker in the middle
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45This thinner-centred lens spreads parallel rays of light in air.RECALL
Concave lens
It is thinner in the middle
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46This wave behaviour produces spreading around obstacles or through openings.RECALL
Diffraction
It is strongest when the gap is comparable to the wavelength
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