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(c) up
(c) down
(b)
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(b) Projection distance
(c) Screen height
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(c) Screen height
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inch
m
m
inch
m
inch
cm
inch
cm
inch
m
inch
m
inch
cm
inch
cm
inch
30
35
42
7
3
39
15
38
46
1
0
36
14
40
47
57
9
3
52
21
51
62
1
0
49
19
50
59
71
11
4
65
26
64
77
1
1
61
24
60
71
85
13
5
78
31
77
93
2
1
73
29
70
83
100
15
6
91
36
90
109
2
1
85
34
80
95
114
17
7
105
41
103
124
2
1
97
38
90
107
128
20
8
118
46
116
140
3
1
109
43
100
119
143
22
9
131
51
129
156
3
1
122
48
120
143
171
26
10
157
62
156
187
4
1
146
57
150
179
215
33
13
196
77
195
234
4
2
182
72
200
238
286
44
17
261
103
260
321
6
2
243
96
250
298
358
54
21
327
129
325
390
7
3
304
120
300
358
430
65
26
392
154
390
469
9
4
365
144
