Your friend says that red and cyan light produce white light because cyan is
Whether the red and cyan light produces white light because cyan is green and blue; the combination of red, green, and blue is also white.
Explanation of Solution
Introduction:
White is not a color but is contains all the frequencies of visible light. On combining all the range of frequencies, it produces the white color.
White light contains all the frequencies of visible light. The white light is produced by combining the primary colors (Red, green, and blue) with proper intensity. So, the cyan light (green + blue) and red combines to produce the white light.
R+G+B=W
Conclusion:
The cyan is the combination of green and blue. On adding red to this combination, white light is produced.
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