PARAXIAL APPROXIMATION- assumes that the reflection angle within the reflected rays is small enough such that the length of the reflected ray becomes approximately equal to the focal length., GEOMETRIC OPTICS- the study that treats light as a ray., LAW OF REFLECTION- states that the angle of reflection is equal to the angle of incidence., PLANE MIRROR- is a mirror that has a flat and smooth surface., SPHERICAL ABERRATION- is a defect that occurs when the outer parts of a mirror do not bring light rays into a similar focus as that of the central part..

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