Colored Contact Lenses
Recent developments in contact linguistics suggest considerable overlap of branches such as historical linguistics, variationist sociolinguistics, pidgin/creole linguistics, language acquisition, etc. This book highlights the complexity of contact-induced language change throughout the history of English by bringing together cutting-edge research from these fields. Special focus is on recent debates surrounding substratal influence in earlier forms of English (particularly Celtic influence in Old English), on language shift processes (the formation of Irish and overseas varieties) but also on dialects in contact, the contact origins of Standard English, the notion of new epicentres in World English, the role of children and adults in language change as well as transfer and language learning. With contributions from leading experts, the book offers fresh and exciting perspectives for research and is at the same time an up-to-date overview of the state of the art in the respective fields.
Calculations on lens systems are often marred by the unjustifiable use of the small-angle approximation. This book describes in detail how the ray and wave pictures of lens behaviour can be combined and developed into a theory capable of dealing with the large angles encountered in real optical systems. A distinct advantage of this approach is that Fourier optics appears naturally, in a form valid for arbitrarily large angles. The book begins with extensive reviews of geometrical optiks, eikonal functions and the theory of wave propagation. The propagation of waves through lenses is then treated by exploiting the close connection between eikonal function theory and the stationary phase approximation. Aberrations are then discussed, and the book concludes with various applications in lens design and analysis, including chapters on laser beam propagation and diffractive optical elements. Throughout, special emphasis is placed on the intrinsic limitations of lens performance. The many practical insights it contains, as well as the exercises with their solutions, will be of interest to graduate students as well as to anyone working in optical design and engineering.
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Colored Contact Lenses