ray of ray of light light ray of 40° ray of 40° light light 40° 50° Which of the above figures follows the 1st law of reflection? O C B D O A 40° 50⁰ 50% D 50°
ray of ray of light light ray of 40° ray of 40° light light 40° 50° Which of the above figures follows the 1st law of reflection? O C B D O A 40° 50⁰ 50% D 50°
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Transcribed Image Text:### Reflection and the First Law of Reflection
#### Diagrams of Light Rays Reflecting from a Surface
In the following diagrams (A, B, C, and D), light rays are being reflected off a surface. The angle of incidence and angle of reflection are indicated. The angle of incidence is the angle between the incident ray (incoming ray) and the normal (an imaginary line perpendicular to the surface at the point of incidence). The angle of reflection is the angle between the reflected ray (outgoing ray) and the normal.
The First Law of Reflection states that the angle of incidence is equal to the angle of reflection.
#### Diagrams:
1. **Figure A**
- Angle of incidence: 40°
- Angle of reflection: 50°
- Normal indicated by a dashed line perpendicular to the surface.
2. **Figure B**
- Angle of incidence: 50°
- Angle of reflection: 50°
- Normal indicated by a dashed line perpendicular to the surface.
3. **Figure C**
- Angle of incidence: 40°
- Angle of reflection: 40°
- Normal indicated by a dashed line perpendicular to the surface.
4. **Figure D**
- Angle of incidence: 50°
- Angle of reflection: 40°
- Normal indicated by a dashed line perpendicular to the surface.
#### Question:
Which of the above figures follows the 1st law of reflection?
- **A**:
- **B**:
- **C**:
- **D**:
#### Answer Options:
- C
- B
- D
- A
#### Correct Answer:
The correct figure that follows the 1st law of reflection is **C**, where the angle of incidence equals the angle of reflection (40° = 40°).
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