Large field spectrographs are severely influenced by atmospheric refraction. We discuss the effect of differential refraction across the field as well as the chromatic effects for the Norris ...

WE are writing to direct attention to a source of error which may occur in spectroscopic investigation of the infra-red region of the spectrum. On reviewing the ...

Recent experiments that demonstrate the negative refraction of light could bring a heated scientific debate to a close, and give negative-index materials a positive future Figure 1: Negative-index ...

Refractive errors are common eye issues that can cause blurry or distorted vision. Treatment usually involves wearing glasses or contact lenses or getting procedures ...

Please provide your email address to receive an email when new articles are posted on . It would seem logical that emmetropia is the ideal refractive state of the eye. Emmetropia puts far away objects ...

A new class of optical thin-film materials enables the refractive index to be tuned to extremely low values. E Fred Schubert and colleagues believe that this capability could have important ...

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