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Transcript
Chapter 13: Lenses and Optical Devices 13.1 Lenses and the Formation of Images Basic Lens Shapes • Converging Lens – Parallel light rays converge through a single point after they travel through the lens. – Lens is thickest in the middle. • Diverging Lens – Parallel light rays diverge after they travel through the lens. – Lens is thickest at the edge. 2 Converge Diverge Lenses use Refraction • Light is refracted twice as it passes through a lens: once from air to glass, and once from glass to air. • Ray diagrams are simplified by drawing a line through the center of the lens and showing refraction occurring at this line. Converging Lenses • The Optical Center (O) is point at the exact centre of the lens. • The Principal Focus (F) is the point at the principal axis of a lens where light rays parallel to the principal axis converge after refraction. • The Secondary Principal Focus (F’) is on the same side of the lens relative to the incident rays. F and F’ are at an equal distance to the optical centre. 5 Converging Lens •A converging lens brings parallel light rays together through a principle focus (F) after refraction. •The principal focus of a converging lens is on the opposite side of the lens as the incident rays. Terminology of Diverging Lenses • Light rays of a diverging lens do not converge. If you project these diverging rays backwards, it looks as if they come from a virtual focus. This is the principle focus (F). • The secondary focus (F’) is on the other side of the lens where the rays actually diverge. Diverging Lens Homework / Classwork P. 553 # 2, 3, 5, 6