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Chapter Nine RAY OPTICS AND OPTICAL INSTRUMENTS - …

Chapter NineRAY OPTICSAND INTRODUCTIONN ature has endowed the human eye (retina) with the sensitivity to detectelectromagnetic waves within a small range of the electromagneticspectrum. Electromagnetic radiation belonging to this region of thespectrum (wavelength of about 400 nm to 750 nm) is called light. It ismainly through light and the sense of vision that we know and interpretthe world around are two things that we can intuitively mention about light fromcommon experience. First, that it travels with enormous speed and second,that it travels in a straight line.

and make small angles with the principal axis. The reflected rays converge at a point F on the principal axis of a concave mirror [Fig. 9.3(a)]. For a convex mirror, the reflected rays appear to diverge from a point F on its principal axis [Fig. 9.3(b)]. The point F …

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