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A set of three mutually perpendicular reflective surfaces, placed to form the internal corner of a cube, work as a retroreflector. The three corresponding normal vectors of the corner's sides form a basis (x, y, z) in which to represent the direction of an arbitrary incoming ray, [a, b, c].
Because the examiner is trying to elicit whether the patient falls when the eyes are closed, it is advisable to stand ready to catch the falling patient. For large subjects, a strong assistant is recommended. Romberg's test is positive if the patient falls while the eyes are closed. Swaying is not a positive sign as it shows proprioceptive ...
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Two horse lenses suspended on water by cling wrap with four approximately parallel lasers directed through them. The 1 cm spaced grid indicates a near focus focal length of around 6 cm. Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its
Kelvin's cat's eye pattern of streamlines near a critical layer. If a real-valued phase speed c {\displaystyle c} is in between the minimum and maximum of U ( z ) , {\displaystyle U(z),} the problem has so-called critical layers near z = z c r i t {\displaystyle z=z_{\mathrm {crit} }} where U ( z c r i t ) = c . {\displaystyle U(z_{\mathrm ...
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White cats having one blue and one other-colored eye are called "odd-eyed" and may be deaf on the same side as the blue eye. [16] This is the result of the yellow iris pigmentation rising to the surface of only one eye, as blue eyes are normal at birth before the adult pigmentation has had a chance to express itself in the eye(s).
The owner of a cat meat restaurant in Vietnam is happy to put his business behind him after killing 300 cats per month to make enough income. ... A Vietnamese restaurant that is believed to have ...