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EXPERIMENT SEQUENCE 1 Optical elements
Laws of reflection
Neutralization of spherical lenses
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180 meridian angle of incidence aperture apical angle astigmatic lens axis meridian back surface back vertex power base curve base setting bifocal lenses calculated centimetres concave convex lens cross curve crossline chart curve under test 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 Hence horizontal meridian horizontal prismatic effect incident ray lens measure lens surface light main lens master curve metres millimetres negative lens neutralizing set object obtain optical axis optical bench parallel plane mirror positive lens power F power meridian prescription principal meridians prism dioptres Prism due Procedure protractor radius of curvature ray box Record your results reflected refractive index segment top shown in Figure spectacle sph.-cyl spherometer straight edge tangent scale thickness thin lens toroidal surface totally internally reflected transverse test unknown lens visual point