# Physics Outline Ch. 14

Topics: Refraction, Refractive index, Lens Pages: 4 (1201 words) Published: April 28, 2014
﻿Chapter 14 Outline
I. Refraction of Light
A. Refraction is the bending of light at the boundary of two media. 1. It is caused by differences in the way light travels in the two media a) Light changes speed unequally.
(1) One side of the light becomes slower/faster
2. If light is perpendicular to the new medium, light will not refract a) If the media have the same index of refraction, light will not refract B. Index of Refraction
1. How well light travels through a medium is measured by its index of refraction a) Larger the index the slower light travels
2. N = C/v where N is the index of refraction C is the speed of light in a vacuum and V is the speed of light in the medium. a) N has no label and speeds are in m/s
C. Refraction is what causes object to appear in different locations when the light from the object goes between media 1. Refraction depends upon wavelength.
a) Smaller the wavelength, the more refraction
2. The difference in the amount of bend between polychromatic light causes a spectrum to appear D. Snell’s Law
1. Ni sinqi = Nrsinqr
a) Where Ni =index of refraction of the incident material (original medium) b) qi = the angle of incidence
c) Ni =index of refraction of the refracting material (final medium) d) qr = the angle of refraction
II. Thin Lenses
A. Concave vs. Convex
1. Concave
a) Diverging lens- light bends away from a point.
b) Negative focal length
c) Thick at edges and thin in the middle
d) Always creates virtual, reduced, upright images
B. Convex
1. Converging lens- light bends towards a point.
a) Positive focal length
b) Thick in middle and thin at the edges
c) Can create real or virtual; enlarged, same size, or reduced; or inverted or upright images. d) No image also possible
C. Lens Equation
1. 1/f =1/p+1/q (same as mirror)
a) Where f = focal length
b) positive for convex and negative for concave
c) p =object distance
d) q = image distance
D. Magnification
1. M= -q/p =h’/h
2. Where M =...

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