®
B a s i c O p t i c s S y s t e m
E x p e r i m e n t 1 0 : R e v e r s i b i l i t y
28
Record Data
Trial 1
1.
Turn the ray table so
the incoming ray
enters the lens
through the
flat
sur-
face (see Figure
10.2).
2.
Rotate the ray table
to set the angle of
incidence to each of
the values listed in
the first column of
Table 10.1. For each
angle of incidence
(
θ
i1
), observe the
corresponding angle
of refraction (
θ
r1
)
and record it in the second column of the table.
Trial 2
1.
Copy all of the values in the second column to the third column of the table. (In
other words, the angles of refraction that you observe in Trial 1 will be the angles
of incidence that you use in Trial 2.)
2.
Turn the ray table so the incoming ray enters the lens through the
curved
surface.
3.
For the angles of incidence (
θ
i2
) that you wrote in the third column of the table,
observe the corresponding angles of refraction (
θ
r2
) and record them in the fourth
column.
Analysis
1.
Using your values for
θ
i1
and
θ
r1
and Snell’s Law (Equation 10.1), determine the
index of refraction of acrylic (
n
acrylic
). Assume the index of refraction of air (
n
air
)
is 1.0.
(eq. 10.1)
n
acrylic
= ___________ (from
θ
i1
and
θ
r1
)
2.
Determine
n
acrylic
again, this time using your values of
θ
i2
and
θ
r2
.
n
acrylic
= ___________ (from
θ
i2
and
θ
r2
)
Questions
1.
Is the law of refraction the same for light rays going in either direction between
the two media?
2.
Does the principle of optical reversibility hold for reflection as well as refraction?
Explain.
Table 10.1: Data
Trial 1
Ray Incident on Flat Surface
Trial 2
Ray Incident on Curved Surface
Angle of Incidence
θ
i1
Angle of Refraction
θ
r1
Angle of Incidence
θ
i2
Angle of Refraction
θ
r2
0°
10°
20°
30°
40°
50°
60°
70°
80°
n
air
θ
i1
(
)
sin
n
acrylic
θ
r1
(
)
sin
=
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 ...