XMM Users' Handbook

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OM telescope

The OM telescope consists of an f/12.7 modified Ritchey Chrétien optics (see schematic in Fig. 66). From the primary mirror incoming light is reflected onto a secondary, from where it is reflected onto a rotatable $45^\circ$ flat mirror located behind the primary, which can direct the beam onto one of two detector assemblies operated in cold redundancy.


  
Figure 66: The light path in XMM's optical/UV telescope, OM.
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European Space Agency - XMM Science Operations Centre