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A rifle scope parallax is a known optical illusion where the target looks out of focus and the focal plance of the target is offset from rifle scope reticle.It is the apparent movement of the reticle when the eyes move off center of the sight picture. rifle scope parallax is a known optical illusion where the target looks out of focus and the focal plance of the target is offset from rifle scope reticle.
specÂ·troÂ·scope. Any of various instruments used to measure the wavelengths and intensity of radiation by splitting the radiation up into a spectrum. In a light spectroscope, light enters a narrow slit, is focused into a thin beam of parallel rays by a lens, and passes through a prism that separates it into a spectrum.