| http://www.w3.org/ns/prov#value | - In addition, from the point of view of obtaining bright display in the reflection mode, it is preferable that the projected area of the gentle slopes A2 on the reference plane is set to be not smaller than 5 times, especially not smaller than 10 times, more especially not smaller than 15 times as large as that of the optical path changing slopes A1 on the reference plane.
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