SNC2D – Physics: Light and Geometric Optics
Grade 10 Optics Unit Test Outline
(page numbers from Science Perspectives 10, Nelson)
Lesson
Topic, Concepts, Terms
Pages
1
What is light and how is it produced?
What are different sources of light?
Bioluminescence, chemiluminescence, incandescence, fluorescence,
phosphorescence, electric discharge, triboluminescence, LED (light
emitting diode)
2
The Electromagnetic Spectrum
Math Review: Re-arranging equations, unit conversions, scientific notation
464-466
3
Uncertainty, significant digits and rounding
Handouts
4
The Ray Model of Light – light travels in straight lines
transparent, translucent, opaque
5
Law of Reflection: angle of incidence = angle of reflection
6
Finding images in a mirror using the Law of Reflection
7
Refraction of light – what is refraction?
What are different refraction phenomena? Mirages, apparent sunset,
apparent depth
8
Index of Refraction equation and calculations
c
n
v
463, 470-476
479
480-485, 489491
515-519
524-528, 535537
Total internal reflection, critical angle: optical waveguides/fibres,
diamonds, prisms
9
Types of lenses (converging and diverging), applications of lenses
Principal axis, lens axis, focal length, primary focus, secondary focus
551-552
10
Images produced by Lenses: Drawing ray diagrams for converging lens
systems
Parallel ray, centre ray, focal ray
Describing images using SALT (Size, Attitude, Location, Type)
Real and virtual image
554-556
11
Thin Lens Equation and Magnification Problems
562-564
h
d
1
1
1

 , M  i  i
f do di
ho
do
12
Review
13
Unit Test - Thursday, April 19 (Day 1), Friday, April 20 (Day 2)
SNC2D – Physics: Light and Geometric Optics
Grade 10 Optics Unit Test Review
1000 m = 1 km
100 cm = 1 m
1000 g = 1 kg
1000 mg = 1 g
60 s = 1 minute
60 minutes = 1 hour
c
n
v
1
1
1


f do di
10 mm = 1 cm
c = 3.00 × 108 m/s
M
hi
d
 i
ho
do
1. Name 3 uses of optics in any of the following fields: medical, scientific, environmental, everyday
applications.
2. Fill in the following table on different sources of light:
Type
Incandescence
Definition
Example
Light created from heating
Light created by living organisms
Chemiluminescence
Firefly, angler fish
Glow stick
Energy is absorbed and
immediately re-emitted as a
different wavelength
CFL bulbs
Light created by friction or
crushing
Duct tape, lifesaver mints
Light created from high voltage
electricity
Lightning
Phosphorescence
Light-emitting diode
SNC2D – Physics: Light and Geometric Optics
3. What is the difference between fluorescence and phosphorescence?
4. What would be the advantages and disadvantages of using fluorescent lighting in your home instead
of incandescent?
5. Place the following types of electromagnetic waves in order from smallest wavelength to largest
wavelength: x-rays, visible light, radio waves
6. While traveling down the highway (posted speed limit: 100 km/h), you estimate that you are traveling
20 m/s. Will you get ticketed for speeding? Write down your conversion factors, and show all your
steps.
7. Write the following in scientific notation, and then round each of the original numbers to 3 significant
digits.
Scientific notation
Rounded to 3 significant digits
0.006087
43, 300.78 g
8. Do the following conversions:
37,500 mg to kg
9. What is the Law of Reflection?
0.0035 km to cm
SNC2D – Physics: Light and Geometric Optics
10. For the plane mirror below, draw a normal to the mirror, a light ray that reflects at an angle
of reflection of 60 degrees, and its incident ray. Clearly label the incident ray, normal,
reflected ray and angle of incidence and angle of reflection.
Mirror
#2
11. Draw the virtual image (the image in the mirror) for the following object. The dark line is
the mirror.
12. Draw a sketch of a light ray traveling from glass (index of refraction, n = 1.52) into water (n = 1.33).
Make sure you draw a normal and show whether the ray bends towards the normal or away from the
normal.
glass
water
SNC2D – Physics: Light and Geometric Optics
Table #1: The Index of Refraction of Various Media
Medium
Index of Refraction (n)
Air/vacuum
1.00
Water
1.33
Ethyl alcohol
1.36
Quartz
1.46
Vegetable oil
1.47
Acrylic
1.49
Glass
1.52
Zircon
1.92
Diamond
2.42
13. Would you expect light passing
through glass to travel faster or
slower than through ethyl alcohol?
14. When light travels from water to
glass, would it bend towards the
normal or away from the normal?
15. Explain why an acrylic stirring rod is almost transparent when submerged in vegetable oil compared
to when it is placed in water.
16. The speed of light in a mysterious substance is 2.04 × 108 m/s. Calculate the index of refraction and
check values in Table #1 above to determine what the substance is. Use the GRASS method, show
all steps.
17. A futuristic science fiction novel writes about a very special material with an index of refraction of
0.90. What is the speed of light in this material? Write down all givens, show your steps (algebra or
formula triangle). Why would this material be so special?
SNC2D – Physics: Light and Geometric Optics
18. In the novel Lord of the Flies, a band of marooned boys use the eyeglasses of a nearsighted boy to
focus light and start fires for warmth and cooking. However, diverging lenses are required to correct
nearsightedness, and cannot be used to start fires. Sketch a converging and a diverging lens and then
sketch what happens to parallel rays when they pass through the lenses to show why diverging lenses
cannot be used.
19. For the following converging lens system, measure the focal length. Label the principal axis and the
lens axis. Use the rules for drawing ray diagrams (Parallel Ray, Centre Ray and Focal Ray) for
converging lenses to find the resulting image. Describe the image using SALT (Size, Altitude,
Location, Type).
2f
f
f
2f
20. For the following converging lens system, draw a ray diagram to show why no focused image is
formed (i.e. you should be able to show that a Parallel Ray and a Centre Ray do not converge in this
case).
2f
f
f
2f
SNC2D – Physics: Light and Geometric Optics
21. An object located 20 cm away from a converging lens produces a focused image 15 cm away from
the lens on the other side of the lens.
(a)
(b)
(c)
(d)
What is the magnification of this lens system?
What kind of image is produced (real or virtual)?
Is the image upright or inverted?
What is the focal length of the lens?
22. A converging lens with a focal length of 15 cm has a 50 cm tall object placed 30 cm away from the
lens.
(a)
(b)
(c)
(d)
Where will the focused image be produced?
What kind of image is produced, and what is its attitude?
What is the magnification of this lens system?
How tall is the image?
23. Give 2 common examples of refraction phenomena.
24. Give 2 examples of applications that make use of total internal reflection.