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Extra info for 2011-2012 Basic and Clinical Science Course, Section 3: Clinical Optics (Basic & Clinical Science Course)
This is not the angle between the incident ray and the optical interface. The reflected ray and the surface normal form the angle of reflection 0,. The law of reflection states that the reflected ray lies in the same plane as the incident ray and the surface normal (ie, the reflected ray lies in the plane of incidence) and that e; = 0, (Fig 2-20). The amount of light reflected from a surface depends on (j; and the plane of polarization of the light. The general expression fo r reflectivity is derived from the Fresnel equations, which are beyond the scope of this text.
If it does not produce its own light, it can only be imaged if it is re flective an d illuminated. Image Characteristics Images are described by characteristics such as magnification, locat ion, quality, and brightness. Some of these features will be discussed briefl y. ""''--------_+--------'--Optical _ _ _ _ ax is Basic Imaging wi th a mirror. In this exam pl e, an upright, mag nified, an d vi rtual image is prod uced because the object is located inside t he foca l point, F (Illustration developed by Figure 2-6 Kevin M.
This ray emerges from the optical system along the line connecting th e posterior nodal point to the conjugate image point (Fig 2-9). These rays fo rm 2 angles with the optical axis. The essential property of the nodal points is that these 2 angles are equal for any selected object point. Because of this feature, nodal pOints are useful for establishing a relationship among transverse magni ficatio n. object distance, and image distance. ) Regardless of the location of an object, the object and the image subtend equal angles with respect to their nodal poi nts.