Optical and Reflective Characteristics Measurement and Focal Length Calculation of a Hollow Tetrahedral Corner and a Solid Highly Retroreflective Cubes

Table 1

The number of Newton rings and focal length for each case individually.

N	[m]	= = [m]	N	D[mm]	[μ]	R[m^2/str]	[m^−1]	f [m]
6.5	360	250	2.2	50	1.25	54.3	-0.01222	-81.81
5.5	450	312	2.0	50	1	130.9	-0.0078	-113
4	600	500	1.8	50	0.75	249.4	0.00834	-119.7
3	900	625	1.5	50	0.5	499.4	-0.0069	-144
2	1800	1250	1.14	50	0.25	999.4	-0.0035	-285
1	2500	2000	1.0	50	0.5	1999.5	-0.0021	-476
0.5	3600	2500	0.5	50	0.125	4899.4	-0.00172	-580.6
0.3	6000	4500	0.2	50	0.075	5749.4	-0.00095	-1052
0.196	7250	5400	0.2	50	0.05	5812	-0.00078	-1269