Nobody has been able to give me a solid answer to my question: If you had a red, green and blue laser, and you combine the three beams to one spot will you see a white spot? Since lasers are coherent the three beams should pass through each other without forming a white spot. Right? Or do our eyes perceive them to be white? What if all three beams were coherent with one another ie. synchronous phase between red,blue & green, will you still see a white spot?