I know that a double-slit experiment pattern for blue, and red light individually gives the intensity patterns easily found in textbooks. But I fail to understand the exact pattern produced by a double-slit experiment where both red AND blue light is used.
My question: When there is a question where it states that a light source is used where it emits both blue and red light in the following setup. And assume that red light is $1.5\lambda$ and blue light is $\lambda$, what is the intensity pattern observed on the screen?
I do not get a good visual representation of what will occur, but I do get approaching this by merging the intensity pattern for the blue light and red light individually. But cannot exactly describe the shape. I would appreciate the explanation.