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# Physics 2 Mech - Unit 4 - Refraction

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## Angela Forlizzi

on 31 December 2017

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#### Transcript of Physics 2 Mech - Unit 4 - Refraction

Refraction
the bending of a wave as it passes at an angle from one medium to another

some of wave will still reflect (in most cases)

2nd medium must be transparent

Pg. 562, fig. 15-2
1. the angle

2. light changes speed as it travels from one medium to another

as the wave hits the 2nd medium at an angle, they will change speed

BUT...one side changes speed sooner and a pivot is created on one side or the other, turning the wave
Why does refraction occur?

higher to lower speed
bend towards normal

lower to higher speed
bends away from normal

wavelength change is to
compensate for change
in speed
Why?
Index of refraction
the ratio of the speed of light in a vacuum to the speed in the medium of interest

FORMULA, PG. 564

Law of Refraction
the higher n is, the more the light will bend toward the normal and v.v

can use the n for 2 different media to predict how the light is going to bend

see pg. 565, fig. 15-5
Index of Refraction
use index of refraction to calculate angles

FORMULA

pg. 564, table 15-1

Snell's Law
disappearing glass

disappearing money
WATCH
Refraction
and
Snell's Law
PRACTICE 15A, PG. 567, #1-3

SECTION REVIEW PG. 567, #1-4
Homework
Refraction - Physics 2
Full transcript