F11Physics1CLec26C

# F11Physics1CLec26C - Physics 1C Lecture 26C "There are two...

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Physics 1C Lecture 26C " There are two kinds of light--the glow that illuminates, and the glare that obscures." --James Thurber

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Outline Facebook Thin Lens equation Image formation summary The Eye Lenses in series
Thin Lens Equation Example An object is placed 10cm to the left of a converging lens that has a focal length of 10cm. Describe what the resulting image will look like (i.e. image distance, magnification. ..). Answer The coordinate system defined. The center of the lens is the origin. Object N F No Image

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Thin Lens Equation Answer First, turn to the thin lens equation: The image is at infinity. This means that there is no resulting image. 1 p 1 q 1 f 1 q 1 f 1 p 1 10cm 1 0 q  
Thin Lens Equation Example An object is placed 15cm to the left of a diverging lens that has a focal length of 10cm. Describe what the resulting image will look like (i.e. image distance, magnification. ..). Answer The coordinate system defined. The center of the lens is the origin. Object N F Image

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Thin Lens Equation Answer First, turn to the thin lens equation: where the negative sign means that the image is on the same side of the lens as the object (i.e. the left side of the lens). The magnification of the object will be: 1 p 1 q 1 f
Thin Lens Equation Answer From the thin lens and magnification equations we find that the image is: Diminished (| M| = 0.40 < 1). Upright ( M = +0.40 > 0). Virtual ( q = –6.0cm < 0; same side as object). Located about halfway between the near focal point and the lens ( q = –6.0cm, f = –10cm).

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Ray Diagrams Object N F Image Let’s check the answer by making a quick ray diagram of the situation: Ray 1 : parallel then away from near focal point.
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## This note was uploaded on 12/11/2011 for the course PHYS 1C taught by Professor Smith during the Fall '07 term at UCSD.

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F11Physics1CLec26C - Physics 1C Lecture 26C "There are two...

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