If that were the case, then everything we see would scintillate between shades of red, blue and green as we move our heads. Because if the stream of photons coming from that point source are accurately focused, they would only hit one cone at a time: say red. Then when you moved your head slightly, that point source would hit a different cone, say green. And so on.
This assumes that only one cone will respond to a specific frequency. This is not true. As this diagram shows, the responses of the cones overlap, so you get a continuously varying mixture of colours as the wavelength varies.
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