Question 1
Open questionIn the context of SSC (Staff Selection Commission) exams or general physics, explain what the angle of reflection is and how it relates to the angle of incidence as per the laws of reflection.k
Formula:
Where:
- = angle of reflection
- = angle of incidence
A
A: 0° - No reflection occurs
B
B: 45° - When incident angle is 45°k
C
C: 90° - Perpendicular to surface
D
D: 180° - Complete reversal
Answer and explanation
Correct Answer: B — B: **45°** - When incident angle is 45°k
Law of Reflection: The angle of reflection equals the angle of incidence.
Key Points:k
- Both angles are measured from the normal (perpendicular to the surface)
- The incident ray, reflected ray, and normal all lie in the same plane
- This law applies to all types of reflection
Mathematical Relationship:
📊 Example Data:
| 📐 Incident Angle | 🔄 Reflected Angle | 🪞 Surface Type | ✅ Verification |
|---|---|---|---|
| 30° | 30° | Plane Mirror | θᵣ = θᵢ ✓ |
| 45° | 45° | Plane Mirror | θᵣ = θᵢ ✓ |
| 60° | 60° | Plane Mirror | θᵣ = θᵢ ✓ |
💡 Note: This fundamental law forms the basis for understanding mirrors, periscopes, and many optical instruments used in physics.