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Chapter-03 Prism

BOOK TITLE: Optician’s Guide (A Mannual for Opticians)

Author
1. Bhootra Ajay Kumar
ISBN
9789351528241
DOI
10.5005/jp/books/14237_4
Edition
3/e
Publishing Year
2018
Pages
3
Author Affiliations
1. Kolkata, India, Kolkata, West Bengal, India, Diploma in Sportvision (UK), Krishnalaya School of Optometry, Kolkata, West Bengal, India, ICLEP FIACLE (Australia); (UK)
Chapter keywords
Prism, apex, deviation, lens decentration, optical lens, lensometer, prism diopter

Abstract

The prism may be defined as two plane optical surfaces which are not parallel to each other but are inclined at a definite angle and enclose a medium with uniform refractive index different from that of the medium outside. The point at which these two surfaces meet is called apex or apical angle and the surface opposite to apex is termed as the base of the prism. In optics prism glass is used to produce the deviation of rays of light at a given distance. A ray of light striking the front surface of the prism is deflected towards the base of the prism and image seems to be deflected towards the apex of the prism. A glimpse on application of prism in optics, prism and lens decentration, and detection of prism in an optical lens has been presented in this chapter.

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