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Correct Answer : Transmitter power is high and requires ground assistance
Explanation : The Doppler system is self contained, it requires no ground based stations or satellite transmitters. The airborne transmitter power requirements are extremely small, which leads to low weight, size, and cost of equipment.
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
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 (C) : Angular size of image
