refractive index - 2024 ACF Winter

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	5	14.00	100%	40%	0%
2024 ACF Winter at Northwestern	2024-11-16	Y	7	17.14	86%	71%	14%
2024 ACF Winter at Ohio State	2024-11-16	Y	1	20.00	100%	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


Stanford L	Berkeley C	10	10	0	20
Stanford A	Berkeley A	10	0	0	10
Stanford M	Berkeley B	10	0	0	10
Alabama A	Georgia Tech C	10	0	0	10
Auburn A	Georgia Tech E	10	10	0	20
Georgia A	Clemson A	10	0	0	10
Georgia Tech A	Emory A	10	0	0	10
Georgia Tech B	Georgia Tech D	10	10	0	20
Miami	UChicago D	10	0	0	10
Purdue B	Northwestern A	10	10	0	20
SIUE A	Purdue D	0	0	0	0
UIUC A	Indiana B	10	10	0	20
UIUC B	UChicago B	10	10	10	30
WashU B	UIUC C	10	10	0	20
Indiana A	UIUC D	10	10	0	20
Michigan B	Kenyon A	10	10	0	20
Ohio State B	CWRU A	10	10	0	20
Ohio State A	CWRU D	10	10	0	20
Michigan B	Kenyon A	10	0	0	10
Michigan B	Kenyon A	10	0	0	10
Michigan B	CWRU B	10	0	0	10
Michigan B	CWRU B	10	0	0	10
Michigan C	Pitt B	10	0	0	10
Michigan State A	Kenyon B	10	0	0	10
Michigan State B	CWRU B	10	0	0	10
Pitt A	Ohio State C	10	10	0	20
Michigan B	Kenyon A	10	10	0	20
Mississippi State	Arkansas	10	0	0	10
Central Oklahoma	Ole Miss	10	10	0	20
Colorado College	McGill E	10	0	0	10
Missouri	Vassar B	10	10	0	20
Iowa	NYU A	10	0	0	10
NYU B	Texas B	10	10	0	20
Oregon State	WUSTL A	10	10	0	20
Vassar A	Texas C	10	10	0	20
Alberta	SFU	10	10	0	20
UBC A	UBC B	10	0	0	10
UW A	UW B	10	0	0	10
Florida Tech B	Florida State University A	10	0	0	10
UF A	UCF B	10	10	0	20
UCF A	UF B	10	10	0	20
UF C	Florida Tech A	10	0	0	10
UF D	UF F	10	0	0	10
Michigan B	CWRU B	10	10	0	20
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
Michigan B	CWRU B	10	10	0	20