As shown in FIG 2, the image beam C emits to {TAIL ~ the beam splitter} 30 with an incidence angle θ between 0 and 90 degrees , and the preferable incidence angle θ is between 40 degrees and {HEAD ~ 50 degrees} 
As shown in FIG 2 , the image beam C emits to { TAIL ~ the beam splitter } 30 with an incidence angle θ between 0 and 90 degrees , and the preferable incidence angle θ is between 40 degrees and { HEAD ~ 50 degrees }
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