The gain of a light reflected in the direction at 20° or more from the specular reflection direction of the incident light is 0.02 or less, in which the gain is obtained by normalizing a reflected light intensity using {HEAD ~ a specular reflection intensity} of {TAIL ~ a standard diffuse plate} as 1 
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The gain of a light reflected in the direction at 20 ° or more from the specular reflection direction of the incident light is 0.02 or less , in which the gain is obtained by normalizing a reflected light intensity using { HEAD ~ a specular reflection intensity } of { TAIL ~ a standard diffuse plate } as 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH