1. Speed and Refraction

 

a) If fused quartz is faster?

 

 

 

 

 

D

(angle of refraction > angle of incidence)

 

 

b) If fused quartz is slower?

 

 

 

 

 

B

(angle of refraction < angle of incidence)

 

c) Fused quartz same speed as Medium X

 

 

 

 

C

(No bending)


 

 

d) This ray is not possible

 

 

 

 

 

 

A

(light always crosses over normal)

 


 

 

If Light goes from fast medium to slow, light bends toward the normal
 

 

 

 

 

Slow medium to fast,
light bends away from the normal

 


  Light Ray leaving water
 and entering Air 
 

 

Velocity of Air > Velocity of Water

 

 

 

 

Angles of incidence and refraction

 

 


 

 

 

If θin = 0 degrees,

no refraction

 

 

(Light must come in at
an angle to be refracted)

 



 

 

 

Which medium is faster?

 

 

 

 

 

Medium A

(larger angle from normal)

 



 

 

A Flame that Burns Underwater!!

School blocks YouTube? Download link below

 Candle_Illusion.mp4

 

 

 

 

 

 

 

When a wave enters another medium,

part of the wave is transmitted, part is reflected.

 

 

 

 

REFRACTION IS ALWAYS
ACCOMPANIED BY REFLECTION

 

 

 

 

Find the missing ray in

the ray diagram below

 

 

 

 

 

 

The reflected ray at the

glass/air boundary is

 missing. 

 

 

 

 

Refraction - David M. Harrison

 

 

 

 

 

Did you know....

A sunset is an optical illusion !!!

 

 

 

 

Refraction allows you
to see the sun
even after it has set. 

 

 

 

 

Which ray diagram is correct?

 

 

 

 

 

Choice 2

(Angle ray leaves air = Angle ray enters air)

 

 


 

 

 

At what angle will the ray reenter the air?

 

June 2008 #72

 

35 degrees

 

 

 

 

 

 

What's wrong with this picture?

 

 

 

 

 

Air is faster than flint glass. second angle should be larger

 

 

 

ns


 

Enrichment


Science of Mirages

Robert Kampf  YouTube Channel

 

 

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