To understand how calculating a map works, think of how a magnified image is obtained using a lens. Light rays are scattered from each part of the object. Each point on the image is produced by having the lens combine the scattered waves from every point on the object. The important thing is that the scattered rays exist whether a lens is there or not; the lens simply collects them to form an image. We’ve discussed how the wavelength of light is almost a thousand times too large to see atoms in a molecule. X-rays, on the other hand, have the right wavelength. Couldn’t we just use X-rays with a
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