Refraction II | Show Me The Physics

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Review -
What Angle Never Produces Refraction?

Video Instruction

showmethephysics.com

Amazing Water Trick
- Amazing Science Tricks Using Liquid

Pins viewed in the glass and outside the glass

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[ Flash ]

1. $Refraction II lesson illustration$ Speed and Refraction $Refraction II lesson illustration$

a) If fused quartz is faster?

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(angle of refraction < angle of incidence)

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c) Fused quartz same speed as Medium X

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(No bending)

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d) This ray is not possible

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(light always crosses over normal)

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

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Slow medium to fast,
light bends away from the normal

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Light Ray leaving water
and entering Air

Velocity of Air > Velocity of Water

Ifθ_in = 0 degrees,

No Refraction

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

Which medium is faster?

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Medium A

(larger angle from normal)

REFRACTION IS ALWAYS
ACCOMPANIED BY REFLECTION

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Find the missing ray in

the ray diagram below

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The reflected ray at

the glass/air boundary

is missing.

Refraction -
David M. Harrison

Did you know....

A sunset is an optical illusion !!!

$Diagram showing atmospheric refraction making the Sun appear above its actual position after sunset$

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

Which ray diagram is correct?

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Choice 2

(Angle ray leaves air = Angle ray enters air)

At what angle will the ray reenter the air?

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June 2008 #72

35 degrees

What's wrong with this picture?

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

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.

Review -
What Angle Never Produces refraction?

Enrichment

$Refraction II lesson illustration$

Science of Mirages

Robert Kampf YouTube Channel

Check Your Understanding

5 quick questions — pick an answer to see if you’re right.

1. Light travels from a fast medium into a slow medium at an angle. How does it bend?

2. A light ray leaves water and enters air at an angle. Which is true?

3. Light hits a glass surface with an angle of incidence of 0°. What happens?

4. Light passes from air through a glass block with parallel sides, entering at 35°. At what angle does it leave the glass back into air?

5. You can still see the Sun for a few minutes after it has actually set. Why?

NYSSLS Regents Practice · Waves · Optical Materials

Why Diamonds Sparkle

A jeweler compares several transparent materials. Their indices of refraction are shown in Table 1.

Table 1: Indices of Refraction

Material	Index of Refraction
Water	1.33
Crown glass	1.52
Cubic zirconia	2.17
Diamond	2.42

In which material does light travel slowest?

▶ Want a challenge? Open 6 more Regents-style questions (harder · mixed formats)

Challenge score: 0 / 6

Multiple choice

C1. Light passes from crown glass into water at an angle. How does it bend?

Substitute values

C2. Substitute numerical values into a mathematical representation that can be used to determine the speed of light in cubic zirconia. Then calculate the speed.

v = ( × 10⁸ m/s)() = × 10⁸ m/s

Determine the value

C3. Using Table 1, determine how many times faster light travels in water than in diamond.

v_water ÷ v_diamond =

Support or Refute · Justify

C4. A student makes the following claim.

Claim: A clear gem in which light travels at 2.0 × 10⁸ m/s must be cubic zirconia.

Place a check mark in either the Support or Refute box. Justify your response using a mathematical relationship.

Support Refute

Multiple choice

C5. Cubic zirconia is often used as an imitation diamond. Why does it look similar?

Constructed response

C6. A jewelry company considers using cubic zirconia instead of diamond in its rings. Using evidence from Table 1, identify one benefit and one drawback of this design choice.

Refraction Equations →