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Examples
1. If you only have one cone, that doesn’t mean you only see in that one color, it’s not monochromatic, it’s achromatic.
2. Most camera lenses are also achromatic, meaning they focus both red and blue light to the same point.
3. The simplest and still most common achromatic lens consists of two different kinds of glass that focus red and blue light to the same focal length, and the wavelengths in between are only dispersed somewhat.
4. The achromatic lens allowed refracting telescopes to boom once more, and while its invention saw the end of super long monsters there were some pretty big ones, both in length and more importantly in aperture diameter up front.
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