Achromatic Doublet Lens, Dia 25mm x EFL 160mm, AR/AR@550nm

hi this is Scott and this is optics tutorial ten for my youtube video vlog optics realm today we're going to talk about a chromatic doublet so the goal is to understand how an achromatic doublet works have a gift you have a song through focal lengths how to build one up and how they work so what is an achromatic doublet that chromatic doublet is too dissimilar optical materials that have a focal length that shares a shares a common focal length or common focal point for the two wavelength extremes okay so visible that would be red and blue and the middle wavelength is going to be D focus that's just the nature of how these work and the visible that would be green shown here so some definitions chromatic D as an adjective and that the root meaning is that it that it has color whatever you're applying that to it has color or that focus shifts with wavelength likewise a chromatic means wit