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ghost image

  1. In optics: a faint image caused by reflections at uncoated or antireflection-coated surfaces. A prime example is the faint reflection from the uncoated front surface of a rear-surface mirror. Using a front-surface mirror eliminates the ghost image (but may cause other problems).

  2. In spectroscopy: a false image of a spectral line caused by irregularities and imperfections in the ruling of a diffraction grating.

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