What must be used to maintain the optics and operation of an infrared telescope?
A) filters
B) lasers
C) coolant
D) oxygen
E) tertiary mirrors

Question

Quizplus · Accepted Answer

Infrared telescopes require coolant to maintain their optics and operation because they need to be kept at very low temperatures to prevent the infrared radiation from the telescope itself from interfering with the observations.

What Must Be Used to Maintain the Optics and Operation