Pins viewed in the glass and outside the glass

1. Speed and Refraction

a) If fused quartz is faster?

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

 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)

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.

 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?

35 degrees

 What's wrong with this picture?           Air is faster than flint glass. second angle should be larger

A Flame that Burns Underwater!!

When a wave enters another medium,

part of the wave is transmitted, part is reflected.

Enrichment

Science of Mirages