# Merge different wavelength rays

Let's say an array of rays of light is given.
Each ray has a specific wavelength (in the range of visible light).

Example:

ray1 = 470 nm
ray2 = 640 nm
ray3 = 510 nm


Can these rays be merged into a single ray of "white light" which preserve the information of it's components?

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The util information is the wavelength. So this merged ray in that case where all rays are collinear put through a triangular prism will be dispersed as follows: 470, 510, 640, in this order? Thank you! –  Iulius Curt May 8 '11 at 14:04