01:750:228 Lecture Notes - Lecture 3: Eggnog, Eyepiece, Virtual Image
7 Feb 2018
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Because the point between the oberver"s eyes should be in the center, santa is not the oberver! From similar triangles, you can see that the magnification is. Distance from mirror to focus = f = r/2. Distance from mirror to image = s". f: focal length. We will use this equation to relate object and images in several contexts. For s > f: s" = sf/(s-f) > 0 (real image) For s = f: s" = sf/(s-f) = (real image at infinity) For s < f: s" = sf/(s-f) < 0 (virtual image) For s" > 0, light comes together in front of mirror, a real image. For s" < 0, image is behind mirror, a virtual image (no light actually there). 1/s + 1/s" = 1/f s" = sf/(s-f) Yes: a flat mirror is like a concave mirror with r = The object is in front of the mirror, the (virtual) image is behind it.
