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Paper 6Alternative to PracticalPractical3 marks
Investigating the critical angle of a material.
Method
Determining the Critical Angle
A light ray is directed at the boundary between water and air at various angles. The angle at which the light no longer refracts into the air is recorded as the critical angle.
| Angle of Incidence (degrees) | Angle of Refraction (degrees) |
|---|---|
| 0 | 0 |
| 30 | 20 |
| 45 | 30 |
| 60 | 45 |
| 70 | 60 |
| 75 | 70 |
| 80 | 90 |
- a[3]
Describe the method used to determine the critical angle from the results provided.
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