Assertion: reflecting telescope's mirror | /r/CapableOf | produce diffraction effects
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Source sentences:
text: The secondary mirror and its supports can produce diffraction effects: bright objects have spikes (the ``christmas star effect'').
text: It is easy to get the optics out of alignment, The reflector telescope’s tube is open to the outside and the optics need frequent cleaning, Often a secondary mirror is used to redirect the light into a more convenient viewing spot, The secondary mirror and its supports can produce diffraction effects, The bright objects have spikes.