Chapter 29 B

1
Chapter 29 B

• Light Waves
• Thin Films

2
When light waves that are in phase meet, the
result is

1. brighter light.
2. no light.
3. dimmer light.
4. light of shifted frequency.

3
When light waves that are in phase meet, the
result is

1. brighter light.
2. no light.
3. dimmer light.
4. light of shifted frequency.

4
A beam of white light that reflects from a pair
of closely spaced surfaces has color because some
of the reflected light is

1. converted to a different frequency.
2. deflected.
3. subtracted from the beam.
4. amplified.

5
A beam of white light that reflects from a pair
of closely spaced surfaces has color because some
of the reflected light is

1. converted to a different frequency.
2. deflected.
3. subtracted from the beam.
4. amplified.

6
If a portion of a soap bubble in sunlight appears
greenish blue, then the light canceled by
interference was

1. red.
2. yellow.
3. blue.
4. greenish blue.

7
If a portion of a soap bubble in sunlight appears
greenish blue, then the light canceled by
interference was

1. red.
2. yellow.
3. blue.
4. greenish blue.

8
When light is canceled by the interference in
thin films, the color produced is

1. often brighter than the incident light.
2. a primary color.
3. the complement of the color canceled.
4. iridescent.

9
When light is canceled by the interference in
thin films, the color produced is

1. often brighter than the incident light.
2. a primary color.
3. the complement of the color canceled.
4. iridescent.

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.