refractive index - 2024 ACF Winter at UBC

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]

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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


UBC A	UBC B	10	0	10
UW A	UW B	10	0	10
Alberta	SFU	10	10	20