For
each of the following questions, choose the letter which corresponds to the
correct answer. You can reply to me by simply giving the list of your choices.
Thus:
1= the letter corresponding to your choice for the
answer to question 1
2= the letter corresponding to your choice for the
answer to question 2
etc.
Be
sure to add your full name and your student number in your reply.
Send
your reply to Judah.Levine@Colorado.edu by 11:59 pm on Wednesday, 12 December
I
will post the answers to this problem set about a day after the due date.
In
answering these questions, you may find the following two figures helpful. They
are taken from the textbook. The first is figure 9.11 on page 245 and the
second is figure 10.5 on page 273. The first figure shows how colors are
combined and the second shows the response of the three types of cones in the
eye.
1.
If you see two monochromatic lights which have exactly the same output powers
and whose wavelengths are 410 nm and 420 nm, then
(a)
the intensities look the same but the 420 nm light looks greener
(b)
the intensities and the hues both look the same
(c) the 410 nm light appears brighter
and the hues look the same
*(d) the 420 nm light appears brighter
and the hues look the same
(e) the 420 nm light looks brighter
and greener
2.
The hue of a combination of two monochromatic lights with colors of 650 nm and
570 nm is
(a) red
*(b) orange
(c) yellow
(d) green
(e) blue
3.
To make a light with a perceived color of
560 nm, about how much red would you use?
*(a) 25%
(b) 75%
(c) 2.5%
(d) 7.5%
(e) –3%
4. The color that is complementary to magenta
is
(a) red
(b) orange
(c) yellow
*(d) green
(e) blue
5. The color that is approximately
complementary to 485 nm “sky blue” is
*(a) 595 nm orange
(b) 570 nm yellow
(c) 530 nm green
(d) 650 nm red
(e) the color has no complement
6. To print an object that is to appear green,
you would use
(a) an ink that absorbs cyan
*(b) an inks that absorbs magenta
(c) an ink that absorbs yellow
(d) inks that reflect red and blue
(e) inks that reflect red and yellow
7. A filter that passes only monochromatic red
at 650 nm is placed on top of a filter that passes only monochromatic green at
530 nm. When blue light strikes one side of the pair of filters, the light that
comes out the other side (after passing through both filters) is
(a) red
(b) green
(c) blue
(d) yellow
*(e) black – no light comes out the
other side
8. If you have a bottle of ink that is used to
print objects that are to appear red,
then if you look at the sky through the ink bottle, it appears to be
*(a) red
(b) green
(c) blue
(d) cyan
(e) magenta
9.
In addition to the 3 subtractive primaries, 4 color printing also uses black
ink because the 3 subtractive primaries
(a) used together produce magenta
(b) produce a color that depends on
the order they were printed
*(c) do not produce a deep enough
black when used together
(d) used together produce a dark green
(e) used together produce a dark blue
10.
The description of the hue of a color as perceived by the brain is based on
(a) total intensity, red-blue
difference and yellow-green difference
*(b) total intensity, red-green
difference and yellow-blue difference
(c) total intensity, red-yellow
difference and green-blue difference
(d) intensities of yellow, cyan and
magenta
(e) intensities of red, green and blue
11. Predicting the appearance of a mixture of
paints of different colors
(a) is more accurate than a prediction for mixed
inks because the paints are more viscous and don’t mix together
(b) is just as accurate as a prediction
for mixed inks
*(c) is less accurate than a prediction for mixed
inks because both the paint surface and the substrate reflect light
(d) is more accurate than a prediction for mixed
inks because the paint colors are brighter
(e) is less accurate than a prediction for mixed
inks because of the texture caused by the brush strokes
12. The dyes used in developing and printing
subtractive color film are
(a) red, blue and green
(b) silver halide and metallic silver
(c) black and silver
(d) black and clear white
*(e) cyan, yellow and magenta
13. If black and white film remains in the
developer for too long, the image is spoiled because
(a) all of the silver halide is converted to
metallic silver and the negative turns completely white
(b) all of the silver halide is dissolved in the
developer and nothing remains on the film base
(c) the negative becomes coated with a layer of
dried developer that is opaque
*(d) all of the silver halide is converted to
metallic silver and the negative turns completely black
(e) the developed image is too dark but is otherwise
okay
14.
If a subtractive color film is used to photograph the blue sky, the color of
the negative will be
(a) red
(b) green
(c) blue
(d) magenta
*(e) orange-yellow
15.
The term “reversal film” means that the film
(a) produces color images using the
subtractive primaries
(b) produces color images using the
additive primaries
*(c) produces positive transparencies directly
(d) produces negatives which can then be
printed
(e) produces negatives with complementary
colors