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Correct Answer : f/ number
Explanation : The ratio of focal length to aperture is called the f/ number. For example, an f/10 telescope may have a 30 in. focal length and a 3 in. aperture.
Correct Answer : Option (D) : Optical transmission losses
Explanation : For anti-reflection coated optics, the optical transmission losses may be 1% or 2% at each air to glass or glass to air optical control surface within the telescope, including windows or sensor covers or surfaces. For uncoated optics, the loss per surface is about 4% to 5%.
Correct Answer : Option (B) : f/ number
Correct Answer : Option (C) : Angular size of image
