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North East School Division
Unpacking Outcomes
Unpacking the Outcome
Examine  how waves refract
Outcome (circle the verb and underline the qualifiers)
PS20-PW3 – Analyze, using physical materials, ray diagrams, and mathematical equations, how waves refract at boundaries
between different media.
KNOW
UNDERSTAND
BE ABLE TO DO
Key vocabulary – ray, refraction, reflection,
critical angle, total internal reflection,
refractive index, medium
converging/diverging lenses, ray diagram,
type (real or virtual), attitude, orientation
(upright or inverted), position (relative to
optical center), fibre optics, polarization,
wave, boundary, magnification
The students will understand
that:
 Light bends as it passes
from one medium to
another
 Light speeds up/ slows
down when travelling from
one medium to another
 Bending (refraction of light)
and change in speed of light
are related to one another
 We have special names for
characteristics of images
 We can calculate bending
of light (refraction) and
change in speed
mathematically
 Refraction has many
important applications in our
everyday lives

Prior knowledge – properties,
characteristics of one, two and threedimensional transverse waves, ray
diagrams, mathematical equations for
reflection of waves
Concepts/ Skills to be learned  Snell’s law and application
 How to examine and investigate
 How to identify image characteristics for
converging and diverging lenses
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Examine the behavior of waves, including partial reflection and
refraction, the critical angle, and total internal reflection, at a
boundary between different media.
Relate refraction, and the refractive index of a medium, to the
change in the speed and direction of waves at a boundary
between different media.
Investigate image formation in converging and diverging lenses,
including constructing ray diagrams.
Identify the characteristics, including type (real or virtual),
attitude/orientation (upright or inverted), magnification (smaller,
larger, or same size), and position (relative to the optical center)
of images formed in converging and diverging lenses.
Apply Snell’s Law
and the magnification
and lens equations
to solve
problems related to the refraction of waves.
Explore applications related to fibre optics, lenses, and human
vision including polarization, the lens makers equation, and total
internal reflection.
ESSENTIAL QUESTIONS
Why does your fishing rod appear to break when you stick it in water?
Why are we learning all of these new words? Why is science like a language?
Why did the internet go down today?
Why do some people wear glasses?
How is it that we can make a fire with a magnifying glass?
Doesn’t love make a diamond shine?
Why does the paramecium appear so large under a magnifying glass?
How do telescopes make planets and stars look so large?