Patent Number: 
Section: claims

1. An X-ray generator for generating plasma and X-ray emitted from the plasma, said X-ray generator comprising:a unit for generating the plasma;a first reflection optical system for introducing the X-ray to a condensing point; anda second reflection optical system for introducing the X-ray to the condensing point being done without the x-ray going through said first optical system,said first and second reflection optical systems have different number of reflections. 2. An X-ray generator according to claim 1, whereinsaid first reflection optical system includes a spheroid mirror; andsaid second reflection optical system includes a spheroid mirror and a hyperboloid mirror. 3. An X-ray generator according to claim 1, whereinsaid first reflection optical system includes a spheroid mirror; andsaid second reflection optical system includes plural mirrors each having a curvature. 4. An X-ray generator according to claim 1, further comprising a debris mitigation system for preventing debris generated at a light emitting point of the X-ray from reaching one of said first and second reflection optical systems. 5. An X-ray generator according to claim 4, further including an other optical system other than said first and second the reflection optical systems that enlarges a light intensity distribution at the condensing point of the X-ray formed by the one of said first and second optical systems, with respect to an angle from an optical axis. 6. An X-ray generator according to claim 4, wherein an other optical system other than said first and second reflection optical systems includes a rotationally symmetrical mirror. 7. An X-ray generator according to claim 1, wherein said X-ray has a wavelength of 20 nm. 8. An exposure apparatus comprising:an X-ray generator according to claim 1;an illumination optical system for illuminating a reticle having a pattern with X-ray generated by said X-ray generator; anda projection optical system for projecting the pattern of the reticle illuminated by said illumination optical system, onto an object to be exposed. 9. A device manufacturing method comprising the steps of:exposing an object using an exposure apparatus according to claim 8; and developing the object exposed.