| http://www.w3.org/ns/prov#value | - In accordance with this embodiment, the absorptive effect is given to only the filters 405R, 405G and 405B. However, the effect of 1. can be further enhanced by adding the shield plates or the filters exhibiting the action to absorb the white light or specific color light to any areas other than the area through which not the scattered light but the normal light beam pass.
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