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Optics and Light Unit Test
SNC2D
Name:
Mark:
/63
Part A: Multiple Choice – Select the most appropriate response (8 marks)
1. In which type of type of light is created by a chemical reaction
a. Incandescence
b. Fluorescence
c. Chemiluminescence
d. Phosphorescence
2. Light travels as…
a. A beam
b. A ray
c. A wave
d. A passenger on Air Canada
3. The Laws of Reflection states that…
a. The angle of incidence is equal to the normal
b. The angle of reflection is always 90 degrees
c. The angle of incidence is equal to the angle of reflection
d. The angle of incidence and the angle of reflection added together to
equal 90 degrees
4. In which of the following mirrors can you always expect an image that is
virtual and the same size as the object?
a. Spherical
b. Convex
c. Concave
d. Plane
5. Refraction is a property of light as it…
a. Travels to our planet
b. Travels through the same medium
c. Travels from one medium to another
d. Reflects off a mirror
6. If the magnification of an image in a pinhole camera is always negative,
which of the following must always be true?
a. It will be inverted
b. It will be right side up
c. It will be virtual
d. All of the above
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7. What is the line that is perpendicular to the reflecting surface called?
a. Incident ray
b. Reflected ray
c. Normal
d. Centre of curvature
8. Humans can naturally see which of the following?
a. Visible light
b. Gamma rays
c. Ultraviolet rays
d. Infrared waves
Part B: Short Answer – You may sketch or describe how lenses/mirrors work
where appropriate; Complete the following questions carefully and
completely (you may answer in point form) (15 marks)
1. Complete the following tables
Characteristic
Converging Lens
What is the shape of the
lens?
Diverging Lens
What happens to rays
once they hit the lens?
(4 marks)
Characteristic
What is the shape
of the mirrors?
Type of Image
Produced
(6 marks)
Concave Mirror
Convex Mirror
Plane Mirrors
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2. Briefly describe how the eye works to form an image. Include the following
terms in your response: cornea, pupil, and retina (3 marks)
3. On ambulances, the word AMBULANCE is written backwards. Explain why
you think the word is purposely written backwards (2 marks)
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Part C: Diagrams – Answer each of the following questions carefully and
completely. (30 marks)
1. Complete the following pinhole camera diagrams. Find the images (3 marks
each = 6 marks)
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2. List the characteristic of an image from a pinhole camera (3 marks)
3. How can you tell from a ray diagram whether an image is real or virtual in a
completed diagram (1 mark).
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4. Find the image in the following plane mirror diagram (4 marks)
5. Find the image in the following concave mirror (4 marks)
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6. Find the image in the following convex mirror (4 marks)
7. Find the image of the following converging lens (4 marks)
8. Find the image of the following diverging lens (4 marks)
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Part D: Calculations – complete each question showing all work (10 marks)
Formulae:
M = hi = -di
ho do
n1sin1 = n2sin2
1/f = 1/ do + 1/di
n = c/v
1. A candle is 30 cm from a pinhole camera. The image is projected on a screen
10 cm from the pinhole. The height of the camera is 3 cm. (4 marks)
a. What is the magnification?
b. What is the height of the image?
2. The speed of light in leaded glass is 1.66 x 108. What is the index of refraction
of this type of glass? (2 marks)
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3. A ray of light approaches a jar of honey at an angle of 30. If the angle of
refraction is 19.5, what is the refractive index of honey? Remember the
index of refraction of air is 1.00. (2 marks)
4. A convex lens has a focal length of 15 cm. An object is placed 20 cm from the
lens. How far from the lens is the image? (2 marks)