(17) SNC2D – Light and Optics – January 6th to January 10th 2014 (REGULAR WEEK)
Date
Mon
Jan
6th
Tues
Jan
7th
Topic/Activities
Refraction of Light
1. What is refraction?
2. What causes refraction?
3. How fast is the speed of light?
4. The Rules for Refraction
The Index of Refraction
5. What is the index of refraction?
6. Mathematically, index of refraction (n) is
the ratio the speed of light in a vacuum (c)
to the speed of light in a medium (v)
𝑐
𝑛=
𝑣
Homework
Complete ALL
Practice Problems on
p. 438 in your lab
activity book
Snell’s Law (handout)
1. Snell’s law is a formula that uses values
for the index of refraction to calculate the
new angle that a ray will take as a beam of
light strikes the interface between two
Complete ALL
Practice Problems on
pp. 441 and 422
2.
media n1 sin 1  n2 sin  2
Assigned Questions: Complete ALL
Practice Problems on pp. 441 and 422
Learning Checkpoint
p. 440 # 1, 2, 3, 4
Refraction Drill
(worksheet)
Learning Goals
 I will be able to predict
how light changes
direction as it travels
through different
transparent media
 I will be able to use the
index of refraction
equation to solve for
“the index of refraction
(n)” and/or “the speed
of light through a
specific medium (v)
Success Criteria
 light bends toward the normal when it slows down in a
medium with a higher index of refraction.
 use the terms refraction and angle of refraction correctly
 describe the inquiry process they used to investigate the
refraction of light as it passes through different media
 explain the conditions required for partial
reflection/refraction to occur
 describe factors that cause the refraction of light as it
passes from one medium to another
 index of refraction for a medium is defined as the ratio of
the speed of light in a vacuum to the speed of light in the
medium; it is dimensionless quantity
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Check and Reflect
p. 447 # 3, 7, 8, 9, 11,
12, 13, 14, 15, 16

I will be able to
communicate the
relationship between
angle of incidence and
angle of refraction as
light travels between
two media
I will be able to
rearrange Snell’s law to
solve for each of its
four variables (n1, n2,
Ɵ1, Ɵ2)
Wed
Jan
8th
Total Internal Refection
1. What is the critical angle?
2. When does total internal reflection occur?
Phenomena Related to Refraction
 Water on Pavement – The Mirage
Lens Basics
1. Converging Lens
2. Diverging Lens
3. Terminology of Converging Lenses
4. Terminology of Diverging Lenses
Read bottom of
p. 443 and
summarize how a
mirage is formed

Check and Reflect
p. 447 # 8
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I will be able to
distinguish between
shape of converging
(convex) and diverging
(concave) lenses
I will be able to
communicate the
properties of
converging and
diverging lenses
Using ray diagrams, I
will be able to
determine how light
achieves a principal
focus point after
passing through a lens
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key terminology – incident ray, refracted ray, angle of
incidence, angle of refraction, medium, index of
refraction, interface, normal
use scientific calculator – use sin button, and use sin-1
(reciprocal)
provide Snell’s law mathematically n1sinƟ1 = n2sinƟ2
rearrange Snell’s law for each variable
use GRASP method to solve optics problems
use reference table for “index of refraction” p. 437 Table
11.5
draw refracted ray based on incident ray and index of
refraction of medium 1and 2
key terminology: converging lens, convex lens, diverging
lens, concave lens, axis of symmetry, optical centre,
principal focus, secondary principal focus, principal axis,
incident ray, refracted ray, focal length
label convex and concave lenses
a converging lens brings parallel light rays together
through a focus after refraction
a diverging lens spreads parallel light rays apart after
refraction so that it looks as if they have come from a
virtual focus
the principal focus of a converging lens in on the
OPPOSITE side of the lens as the incident rays
the principal focus of a diverging lens is on the SAME
side of the lens as the incident rays
Date
Thurs
Jan
9th
Topic/Activities
Diverging Lenses (a.k.a. Concave Lenses)
Homework
Fri
Jan
10th
Converging Lenses (a.k.a. Convex Lenses)
Learning Checkpoint
p. 454 # 1, 2, 3, 4, 5
Learning Goals
 I will be able to explain
the three rules for
diverging lens imaging
 I will be able to predict
image characteristics
for a light source at
various distances from
diverging lens
 Using a ray diagram, I
will be able to locate
virtual image formed by
diverging lens
 I will be able to explain
the three rules for
converging lens
imaging
 I will be able to predict
image characteristics
for a light source at
various distances from
converging lens
 Using a ray diagram, I
will be able to locate
virtual image formed by
converging lens
Success Criteria
 key terminology: diverging lens (concave)
 a diverging lens always produces a smaller, upright, virtual
image, on same side as object
 label a diverging lens ray diagram with optical centre, F,
2F, F’, 2F’, principal axis, axis of symmetry
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key terminology: converging lens (convex)
when an object is beyond 2F’ the image is smaller,
inverted, located between 2F and F, and is real
when an object is at 2F’, the image is the same size,
inverted, located at 2F, and is real
when an object is between 2F’ and F’, the image is larger,
inverted, beyond 2F, and is real
when an object is at F’, no clear image is formed
when inside of F’, the image is larger, upright, on the same
side at the object (behind lens), and is virtual