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7 Refraction.notebook March 09, 2017 Where can we see refraction of light? Define The change in direction of waves (light) at the boundary between two different media. The waves must hit the new medium at an angle for direction to change From the 2D waves lab

Where can we see refraction of light?greenall-physicalscience20.wdfiles.com/local--files/main... · 2018-08-30 · 7 Refraction.notebook March 09, 2017 Where can we see refraction

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Page 1: Where can we see refraction of light?greenall-physicalscience20.wdfiles.com/local--files/main... · 2018-08-30 · 7 Refraction.notebook March 09, 2017 Where can we see refraction

7 Refraction.notebook March 09, 2017

Where can we see refraction of light?

Define 

The change in direction of waves (light) at the boundary between two different media.

The waves must hit the new medium at an angle for direction to change

From the 2D waves lab

Page 2: Where can we see refraction of light?greenall-physicalscience20.wdfiles.com/local--files/main... · 2018-08-30 · 7 Refraction.notebook March 09, 2017 Where can we see refraction

7 Refraction.notebook March 09, 2017

Imagine a car driving towards the sea at an angle. When the first front wheel hits the water, the resistance makes that wheel turn slower than the other wheel. As a result, the car rotates until the second wheel is also in the water. Then both wheels turn at the same time. The car stops rotating.

Pg 488

When the car comes out of the water, the righthand wheel turns faster than the left, so the car rotates again. When both wheels are out of the water, the car stops rotating and moves forward. This is exactly what happens when a light ray hits a denser medium.

Page 3: Where can we see refraction of light?greenall-physicalscience20.wdfiles.com/local--files/main... · 2018-08-30 · 7 Refraction.notebook March 09, 2017 Where can we see refraction

7 Refraction.notebook March 09, 2017

The refractive power of a substance can be found by comparing the speeds of light through the substances.In fact the ratio of these speeds tells you the refractive index of the substance.

cv= n 

n = index of refraction

c = speed of light in a vacuum(3.00 x 108 m/s)

v = speed of light in the substance

Light travels at 1.95×108 m/s in a  substance. what substance is it?

Page 4: Where can we see refraction of light?greenall-physicalscience20.wdfiles.com/local--files/main... · 2018-08-30 · 7 Refraction.notebook March 09, 2017 Where can we see refraction

7 Refraction.notebook March 09, 2017

Light Bending

incident raynormal

glassair

θR

θi

refracted ray

incident ray

normal

θi

Reflected ray

θr

Reflection Refraction

n1sin θ1 = n2 sin θ2

θ2 angle of refraction for substance 2

θ1 angle of incidence for substance 1

n2 index of refraction for substance 2

n1 index of refraction for substance 1

Page 5: Where can we see refraction of light?greenall-physicalscience20.wdfiles.com/local--files/main... · 2018-08-30 · 7 Refraction.notebook March 09, 2017 Where can we see refraction

7 Refraction.notebook March 09, 2017

AirGlass

EX

Water