1. Chapter 29 B
Light Waves
Thin Films

2. When light waves that are in phase meet, the result is
brighter light.
no light.
dimmer light.
light of shifted frequency.
Answer: A

3. When light waves that are in phase meet, the result is
brighter light.
no light.
dimmer light.
light of shifted frequency.
Answer: A

4. A beam of white light that reflects from a pair of closely spaced surfaces has color because some of the reflected light is
converted to a different frequency.
deflected.
subtracted from the beam.
amplified.
Answer: C

5. A beam of white light that reflects from a pair of closely spaced surfaces has color because some of the reflected light is
converted to a different frequency.
deflected.
subtracted from the beam.
amplified.
Answer: C

6. If a portion of a soap bubble in sunlight appears greenish blue, then the light canceled by interference was
red.
yellow.
blue.
greenish blue.
Answer: A

7. If a portion of a soap bubble in sunlight appears greenish blue, then the light canceled by interference was
red.
yellow.
blue.
greenish blue.
Answer: A

8. When light is canceled by the interference in thin films, the color produced is
often brighter than the incident light.
a primary color.
the complement of the color canceled.
iridescent.
Answer: C

9. When light is canceled by the interference in thin films, the color produced is
often brighter than the incident light.
a primary color.
the complement of the color canceled.
iridescent.
Answer: C
Comment: Although iridescent colors are often seen when interference occurs in objects such as sea shells, the color always produced is the complement of the color canceled.