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®
B a s i c O p t i c s S y s t e m
T e a c h e r ’ s G u i d e
48
Part 1, typical results:
Part 1, answers to questions:
1.
The angle of incidence and the angle of reflection are equal.
2.
The three
colored rays are
not
reversed by the mirror.
Part 2, typical results:
The actual radius of both curved mirrors is about 12.5 cm.
Part 2, answers to questions:
1.
The radius of curvature is twice the focal length for a cylindrical mirror.
The typical experimental results confirm this.
2.
The radius of curvature of a plane mirror approaches infinity.
Typical results:
Answer to question:
The ray leaves the rhombus at the same angle it entered.
Experiment 5: Total Internal Reflection
Typical results:
(Step 5)
Measured critical angle:
θ
c
= 41.0°
(Step 6)
Calculated critical angle:
θ
c
= sin
−
1
(1/
n
) = sin
−
1
(1/1.5) = 41.8°
(Step 7)
% Difference = 1.9%
Answers to questions:
1.
The internally reflected ray becomes much brighter when the incident angle is
larger than the critical angle.
2.
The critical angle is greater for red light. This tells us that the index of refraction
is smaller.
Table 3.1: Plane Mirror Results
Angle of Incidence
Angle of Reflection
9.0°
9.2°
16.8°
16.5°
19.0°
37.8°
Table 3.2: Cylindrical Mirror Results
Concave Mirror
Convex Mirror
Focal Length
6.2 cm
6.4 cm
Radius of Curvature
(determined using compass)
13.3 cm
13.2 cm
Angle of Incidence
Angle of Refraction
Calculated index of refraction of
acrylic
38.0°
26.0°
1.40
51.2°
33.8°
1.40
22.0°
14.4°
1.51
Average:
1.44
(4% deviation from accepted value)
Summary of Contents for OS-8515B
Page 6: ... Basic Optics System About the Experiments 6 ...
Page 26: ... Basic Optics System Experiment 9 Apparent Depth 26 ...
Page 38: ... Basic Optics System Experiment 13 Telescope 38 ...
Page 42: ... Basic Optics System Experiment 14 Microscope 42 ...
Page 44: ... Basic Optics System Experiment 15 Shadows 44 ...
Page 46: ... Basic Optics System Telescope and Microscope Test Pattern 46 ...