The Objective and the Eyepiece of a Refracting Astronomical Telescope $320 \mathrm {~cm}$

question 55

Multiple Choice

The objective and the eyepiece of a refracting astronomical telescope have focal lengths of $320 \mathrm {~cm}$ and $4.0 \mathrm {~cm}$ , respectively. The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is $4.96 \times 10 ^ { 7 } \mathrm {~m}$ , and its distance from Earth at the time of observation is $4.4 \times 10 ^ { 12 } \mathrm {~m}$ . What is the angle (in milliradians) subtended by the final telescopic image of Neptune?

• A) \(1.1 \mathrm { mrad }\)
• B) \(1.3 \mathrm { mrad }\)
• C) \(1.5 \mathrm { mrad }\)
• D) \(0.90 \mathrm { mrad }\)
• E) \(1.7 \mathrm { mrad }\)

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