How many kinds of colour-sensing cone cells does the human eye have?
ATwo kinds, called red and blue cones only
BThree kinds, called red, blue and green cones
CFour kinds, called red, blue, green and violet cones
DOne kind, equally sensitive to every wavelength
Answer & Solution
Correct answer: B. Three kinds, called red, blue and green cones
1. Humans have three cones, each sensitive to a different range of wavelengths.
2. These three are called red, blue and green cones, though the names are only approximate.
3. Two cones or four cones would put a human eye outside this stated count of three.
_Source: OpenStax Physics (CC BY 4.0), Ch 15 "Light", section 15.1 The Electromagnetic Spectrum_
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