![background image](http://html1.mh-extra.com/html/pasco/os-8515b/os-8515b_instruction-manual_761147047.webp)
®
M o d e l N o . O S - 8 5 1 5 B
T e a c h e r ’ s G u i d e
47
Teacher’s Guide
Note on procedure:
Student’s expectation may differ from actual results. Encourage them to carefully
observe the resulting colors and describe them accurately.
Part 1, typical results:
Part 1, answers to questions:
1.
Mixing light is not the same as mixing paint. The mixing of colored light
is additive mixing; the mixing of paint is subtractive mixing.
2.
In this experiment the mixture of red, green, and
blue does not look pure white to most people. To produce white light, the three colors must be present in a spe-
cific ratios of intensities.
Part 2, typical results:
(Step 4)
Under red light, black ink is easier to see than red; red ink appears nearly the same color as white paper.
Part 2: answers to questions:
1.
Red ink appears red because it reflects red light and absorbs other colors.
Under blue light, red ink absorbs most of the visible light.
2.
Under red light, red ink is difficult to see because
both ink and paper reflect most of the visible light.
Notes on procedure:
(Step 3)
(a)
Red, Orange, Yellow, Green and Blue are seen in that order.
(b)
Blue is
refracted at the largest angle.
(c)
Blue is predicted to refract at the largest angle because its index of refraction is
largest.
(Step 4)
When colored rays enter the prism, they do
not
emerge parallel to each other because of their
differing indices of refraction.
Table 1.1: Results of Colored Light Addition
Colors Added
Resulting Color
red + blue + green
slightly bluish-white
red + blue
pink-purple
red + green
yellow-orange
green + blue
bluish-green
Table 1.2: Colored Ink Observed Under Colored Light
Color of Light
Line
Apparent Color of Ink
Do they look different?
Actual Color of Ink
Blue Light
A
Black
Yes, slightly
Red
B
Black
Black
Red Light
C
Black
Yes, slightly
Blue
D
Black
Black
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 ...