Radiant Energy and the Ophthalmic LensP. Blakiston's Son & Company, 1921 - 226 pages |
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Common terms and phrases
accommodation and convergence ametropia amplitude appear Asthenopia astigmatism body cathode rays cause CHAPTER ciliary muscle color concave lens concave mirror condition convex lens cornea cross crystalline lens curvature curve cylinder deviate diopter diplopia direction disc distance distant correction divergent draw a line edge emmetropia emmetropic equal ether waves exophoria eyeball Facing page 79 focal length formed glass heat horizontal hypermetropia impinges inches index of refraction lenses let this line light waves line parallel located macula medium meter minus lens myope myopia normal object observed obtained ophthalmoscope optical center parallel rays pass patient placed plane plate Presbyopia principal axis principal focus principal meridians prism Punctum Proximum Punctum Remotum pupil recti rectus reflected refractionist refractive media refractive power result retina retinal image retinoscope right angles rotation secondary axis slit spherical strabismus strength surface theory traveling trial frame velocity Virtual Image vision visual wave front wave length
Popular passages
Page 32 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Page 83 - Tt or the magnification of the telescope is obtained by dividing the focal length of the objective by the focal length of the eyepiece.
Page 71 - In addition to its distance from the nodal point the size of the retinal image depends upon the size of the object and its distance from the eye.
Page 116 - ... (Fig. 13-22). Of these images, one is bright and upright; it is formed by the anterior surface of the cornea which acts as a convex mirror. A larger but dimmer upright image is formed by the anterior surface of the lens. The third image is inverted, bright and smaller than the others; it is formed by the posterior surface of the lens which acts as a concave mirror. If the positions of the images are noted while the subject gazes at a distant point, and he then accommodates for near vision, the...
Page 67 - ... focal length, the image is real, inverted, at a distance of more than twice the focal length, and larger than the object (Fig.
Page 6 - X io~21 that of water at 4°C., or equal to that of our atmosphere at a height of 210 miles — a density vastly greater than that of the same atmosphere in the interstellar spaces.
Page 11 - I = v/n, or v = nl; (1) that is, wave length is equal to velocity divided by the number of vibrations per second, or velocity is equal to the number of vibrations per second times the wave length.
Page 207 - Beginning at the unit figure or decimal point, point off the number into periods of two figures each.
Page 52 - The incident and reflected ray are both in the same plane, which is perpendicular to the reflecting surface. The following are the names of the principal parts of a sextant : In fig.
Page 187 - B on the right, the sign of the subtrahend has been changed from + to — , or from — to +. Notice that the correct result is then obtained by adding. Hence, Rule. — To subtract one number from another, change the sign of the subtrahend and add it to the minuend.