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Laws of reflection
Neutralization of spherical lenses
69 other sections not shown
180 meridian angle of incidence apical angle astigmatic astigmatic lens axis meridian back vertex power base curve base setting bifocal lenses calculated centimetres concave convex lens crossline chart cylindrical surface datum centre DC X 90 decentration determine deviation diameter distance optical centre equation experiment filters focal length focal power focimeter front surface power fused bifocal glass block glazing graph Hence horizontal prismatic effect incident ray inset lens measure lens surface light main lens master curve metres millimetres negative lens neutralizing set object obtain ophthalmic optical axis optical bench parallel plane mirror positive lens power meridian prescription principal meridians prism dioptres Prism due Procedure protractor radius of curvature ray box Record your results reflected refractive index results as follows segment top shown in Figure sph.-cyl sphere curve spherical lenses sphero-cylindrical spherometer straight edge tangent scale thin lens toroidal toroidal surface transverse test unknown lens visual point