Lenses 2 types converging and diverging Oct 289:52 AM Converging Lenses rays that are parallel to the principal axis, strike the lens, and converge to a single point on the opposite side of the lens (they pass through 2 surfaces) Oct 289:58 AM Diverging Lenses rays that are parallel to the principal axis and diverge away from the focal point after they pass through the lens Oct 2810:04 AM 1
Converging Lenses Biconvex lens Planoconvex lens Positive meniscus lens Oct 289:56 AM Diverging Lenses Biconcave lens Planoconcave lens Negative meniscus lens Oct 289:56 AM Do handout: p 98, section 4.1 different types of lenses Nov 76:41 AM 2
4.2 Refraction in lenses: What will happen when light passes through a prism? Draw a diagram Nov 76:42 AM Nov 76:44 AM Nov 76:45 AM 3
Would you agree that the light would behave in a similar way with the biconvex lens? Nov 76:45 AM F O F' Lines parallel to P will converge at F Nov 78:27 AM (not to scale) F O F' f if the rays are not coming parallel to P, they will converge on the focal plane at another point Nov 78:27 AM 4
Terminology focal plane F O F' f O F F' f Focal plane Nov 76:52 AM focal plane Terminology F O F' f O Optical centre = geometric centre F Principal focal point: incident rays parallel to C will converge F' Secondary focal point: symmetrical to F in relation to O f focal length distance of OF (and OF') Focal plane perpendicular to P, passes through F, where the incident rays will converge Nov 76:52 AM Terminology focal plane F O F' f O Optical centre = geometric centre F Principal focal point: incident rays parallel to C will converge Nov 76:52 AM 5
Principal Rays of converging lenses = symbol for converging lenses Nov 76:50 AM F O F' f First principal ray Nov 77:39 AM F O F' f Second principal ray Nov 77:39 AM 6
F O F' f Third principal ray Nov 77:39 AM F O F' f Three principal rays of a converging lens Nov 77:39 AM Diverging lens = Nov 77:55 AM 7
Predict the path of light rays hint # 1 Pull Pull hint # 2 Pull Pull Nov 77:58 AM F O F' f Nov 78:20 AM Diverging mirror F O F' f First principal ray Nov 77:56 AM 8
Diverging mirror F O F' f Second principal ray Nov 77:56 AM Diverging mirror F O F' f Third principal ray Nov 77:56 AM Text book page 105 Nov 78:22 AM 9
Nov 78:19 AM 10
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