Lecture 17 Ray Optics-3 Chapter 23 PHYSICS 270 Dennis Papadopoulos March 22, 2010.

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Presentation transcript:

Lecture 17 Ray Optics-3 Chapter 23 PHYSICS 270 Dennis Papadopoulos March 22, 2010

Total Internal Reflection

Image by Refraction

EXAMPLE A goldfish in a bowl

What is a lens? Device that provides a capability to create bright and well focused images. How? Use Refraction to create images out of divergent light rays Focal point Focal length Property of lens no matter how it is used Distance from lens that paraxial rays converge Reversibility

Converging and Diverging Lenses

Thin Lenses – Real Image –Special Rays Thin lens-> d<<f,s,s’ Inverted Image

Thin Lenses: Ray Tracing

Tactics: Ray tracing for a converging lens

Lateral Magnification The image can be either larger or smaller than the object, depending on the location and focal length of the lens. The lateral magnification m is defined as 1.A positive value of m indicates that the image is upright relative to the object. A negative value of m indicates that the image is inverted relative to the object. 2.The absolute value of m gives the size ratio of the image and object: h'/h = |m|.

s>f  h’/h=s’/s

Virtual Image s’ 0 image upright

EXAMPLE Magnifying a flower s<f

Diverging Lenses Thicker at the edges Demagnification

Diverging lenses Ray Tracing