Humanity has been interested in optics for quite some time, the desire to expand our powers of observation being a powerful motivator for discovery and engineering. One example of this is the Nimrud lens, an oval-shaped rock crystal plate discovered by English archaeologist Henry Layard in 1853. The crystal, dated between 900-700 BCE, is bi-convex and has been theorized to have uses ranging from a simple magnifying glass to being a lens in a telescope Figure 4.1 demonstrates the Nimrud lens as it appears today, along with the surface profile, which is not the perfectly symmetrical shape we are so familiar with today in modern optics.
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