Lecture 18 (Ch. 26.5-26.6)

Lecture 18 (Ch. 26.5-26.6) - Lecture 18 Ch 26 Image...

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Lecture 18 Ch 26, Image Formation, Lenses

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Review: Snells Law Into slower medium : bent towards normal ( θ 2 < θ 1 ) Into faster medium: bent away from normal ( θ 2 > θ 1 )
Total Internal Reflection o When n1 > n2 o There will be a “critical angle” θ c where θ 2 = 90 0 . This happens when: The critical angle for looking from water to air is:

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The critical angle for diamond is about 24.4°, which means that light is much more likely to be internally reFected within a diamond than say, glass. Diamonds for jewelry are cut to take advantage of this; in particular the brilliant cut is designed to achieve high total reFection of light entering the diamond
Imaging with Concave Mirrors The mirror equation: f is the “focal length” o Distance “ p ” is the distance from the object (O) to the center of the mirror (V) o Distance q is the distance from the image (I) to the center of the mirror (V). o Distance R is the radius of curvature of the mirror.

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Magnification o Magnification (M) is defined as the ratio of image “height” to object height M = h’ / h M = -q / p o If image is same size as object (and upright), M = +1 o If object is inverted, M is negative o Note |M| can be less than 1 In that case image is not larger, but actually smaller.
Moving an object towards a concave mirror: C= Center of curvature, F=focal point Object located beyond center of curvature C Image is REAL, inverted, and reduced in size | M| < 1 and M<0, and q>0, q<p Object located at the center of curvature C Image is REAL, inverted, and same size as

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Lecture 18 (Ch. 26.5-26.6) - Lecture 18 Ch 26 Image...

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