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1019 Physiology

The Helmholtz theory’ of colour vision states tha

AThere are three kinds of cones in the retina responding to the three primary colours
BThere are two kinds of cones called dominators and modulators.
CThere is only one kinds of cone and the colour is recognised only in area 17.
DThere are seven types of cones responding to the seven colours of the spectrum.
Physiology
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