Question
Two values of this quantity, each for a different material, appear in Snell’s Law. For 10 points each:
[10e] Name this “index”, the ratio of the speed of light in a given material divided by the speed of light in a vacuum.
ANSWER: refractive index [or index of refraction; prompt on n]
[10m] Materials with this property have different refractive indices along separate axes. The Michel–Levy chart allows one to identify minerals based on their degree of this property.
ANSWER: birefringence [accept birefringent]
[10h] This device uses a birefringent material to convert between linear and circular polarization by introducing a 90-degree phase shift between the two perpendicularly polarized components.
ANSWER: quarter-wave plate [prompt on wave plate]
<Physics>
Summary
| 2024 ACF Winter at UC Berkeley | 2024-11-16 | Y | 3 | 13.33 | 100% | 33% | 0% |
| 2024 ACF Winter at Clemson | 2024-11-16 | Y | 7 | 14.29 | 100% | 43% | 0% |
| 2024 ACF Winter at Northwestern | 2024-11-16 | Y | 10 | 15.00 | 80% | 60% | 10% |
| 2024 ACF Winter at Ohio State | 2024-11-16 | Y | 7 | 14.29 | 43% | 100% | 0% |
| 2024 ACF Winter at Ohio State | 2024-11-16 | Y | 7 | 14.29 | 100% | 43% | 0% |
| 2024 ACF Winter at Online | 2024-11-16 | Y | 8 | 16.25 | 100% | 63% | 0% |
| 2024 ACF Winter at UBC | 2024-11-16 | Y | 3 | 13.33 | 100% | 33% | 0% |
| 2024 ACF Winter at Central Florida | 2024-11-16 | Y | 5 | 14.00 | 100% | 40% | 0% |
| 2024 ACF Winter at Oxford | 2024-11-16 | Y | 10 | 14.00 | 100% | 30% | 10% |
Data
| Durham B | Bristol A | 10 | 0 | 0 | 10 |
| Cambridge C | Bristol B | 10 | 0 | 10 | 20 |
| Cambridge A | Warwick B | 10 | 0 | 0 | 10 |
| Vanderbilt | Cambridge D | 10 | 0 | 0 | 10 |
| Durham A | Manchester | 10 | 10 | 0 | 20 |
| Imperial A | Birmingham | 10 | 0 | 0 | 10 |
| LSE A | Imperial B | 10 | 10 | 0 | 20 |
| LSE B | Oxford B | 10 | 0 | 0 | 10 |
| Edinburgh | Southampton B | 10 | 0 | 0 | 10 |
| Oxford A | Warwick A | 10 | 10 | 0 | 20 |