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Chapter 16 Opening
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Tuesday, April 15:
A light source is placed 10 cm from a surface. A
student measures an illuminance of 48 units. What
illuminance would be measured if the same light is placed
a. ... 20 cm from the surface?
b. ... 30 cm from the surface?
c. ... 40 cm from the surface?
Wednesday, April 16:
Two lights are arranged above a white sheet of
paper. When the lights are turned on they illuminate the
entire sheet of paper (as seen in the diagram at the
right). Each light bulb emits a primary color of light -
red (R), green (G), and
blue (B). Depending on which primary color
of light is used, the paper will appear a different
color. Express your understanding of color addition by
determining the color which the sheet of paper will
appear in the diagrams below.
Thursday, April 17:
White light (red-green-blue) is shown incident
on a sheet of paper which is painted with a pigment which
absorbs one of the primary colors of light. For each
diagram, indicate which color(s) of light are absorbed,
which color(s) of light are reflected.
Friday, April 18:
Opaque objects imparted with pigments
selectively absorb light and reflect whatever light
colors are not absorbed. Filters are transparent
materials which selectively absorb (or block) one or more
primary colors of light and allow the remaining colors of
light to pass through (or be transmitted). The color of
the filter describes which color of light is transmitted
by the filter. The following diagrams depict various
primary colors of light (R for red, B for blue, and G for
green) incident upon a colored filter (C for cyan, M for
magenta, and Y for yellow). Determine which primary
colors of light will pass through the filters.
Monday, April 21:
Consider the diagram shown below. How do the
polarized side windows in these adjacent houses provide
privacy for the occupants? Who can see what? Explain.
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