Grade 10 Science
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Name:________________________
Quiz #6: Refraction
1) Fill in the blanks for the following definitions:
______________ is the bending or changing in direction of light when it travels from
one medium to another.
___________________________ of a medium is the ratio of the speed of light in a
vacuum to the speed of light in that medium.
__________________________________________ is a method of representing very
large numbers or very small numbers, without having to write a large number of zeros.
(6)
The ________________________________ is the incident angle that results in total
internal reflection for a specific medium.
Total internal reflection only occurs when light is travelling from a substance with a
______________________ index of refraction to a _______________________ index of
refraction.
2) What is the speed of light in a vacuum or in air (remember to include a unit)?
(2)
3a) What two things occur to a light ray when it travels from a medium with a lower index of
refraction to a medium with a higher index of refraction?
(2)
b) Draw a diagram showing this phenomena.
(2)
c) Can total internal reflection occur in this situation? Explain.
(2)
4) When spear-fishing, it is important that you aim in front of the fish if you are going to catch
it. Explain why this is true by drawing a detailed diagram below.
(4)
5a) Calculate the speed of light in quartz if its index of refraction is 1.46. Make sure to use
GRASP problem solving method in your answer.
(4)
b) Determine the index of refraction for an unknown substance where light travels at a speed of
2.03 x 108 m/s. Based on your answer, what is the identity of this substance?
Index of Refraction
Air
1.0
Ice
1.31
Pure water
1.33
Ethyl alcohol 1.36
Quartz
1.46
Vegetable Oil 1.47
(5)
Olive Oil
1.48
Acrylic
1.49
Glass
1.52
Zircon
1.92
Diamond
2.42