| 摘要 |
PURPOSE:To observe the state of the surface of a body accurately, by providing a filter, on which the negative picture of the distribution of the reflected light from each part of the surface of the body is formed, between a light source and the body, projecting the light, which is passed through the filter, on the body, and performing the observation. CONSTITUTION:A filter 6, on which the negative picture of the picture of the surface of a body 5 to be observed is formed, is arranged on a path between a ground glass plate 3 and a half mirror 4. Thus the distribution of the incident light is corrected by the distribution of the reflected light, and the distribution J2 of the luminous intensity of the light, which is transmitted through the filter 6, is obtained. Therefore, the state of the surface of the body 5 can be accurately observed.
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