| 摘要 |
PROBLEM TO BE SOLVED: To easily vary the incident angle of light to a sample.SOLUTION: A light beam incident device 10 includes: an off-axis parabolic mirror 14a that receives collimated light beams La1 and La2 and converges the collimated light beams La1 and La2 to one point 1a of a measuring object 1; and an incident-side light receiving surface 12a of the mirror 12 for sending the collimated light beams La1 and La2 to the off-axis parabolic mirror 14a. In accordance with the light receiving part in which the off-axis parabolic mirror 14a receives the collimated light beams La1 and La2, the angles (incident angles &thetas;a1 and &thetas;a2) between the measuring object 1 and convergence light beams Fa1 and Fa2 produced by the convergence of the collimated light beams La1 and La2 vary. The incident-side light receiving surface 12a of the mirror 12 can vary the light receiving part by moving with respect to the off-axis parabolic mirror 14a. |
