The Objective and the Eyepiece of a Refracting Astronomical Telescope

question 13

Multiple Choice

The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm,respectively.The telescope is used to view Neptune and the final image is set at infinity.The diameter of Neptune is 4.96 × 10⁷ m,and its distance from Earth at the time of observation is 4.4 × 10¹² m.What is the angle (in milliradians) subtended by the final telescopic image of Neptune?

• A)0.90 mrad
• B)1.1 mrad
• C)1.3 mrad
• D)1.5 mrad
• E)1.7 mrad

---

Definitions:

Psychological States

Conditions of the mind affecting emotions, behaviors, and thought processes of an individual at a given time.

Acquired Needs Theory

A motivational theory suggesting that individuals are driven by their needs for achievement, power, and affiliation, which are developed over time as a result of life experiences.

Need for Achievement

A psychological trait that drives individuals to pursue and achieve goals, often associated with higher motivation and performance.

Hygiene Factors

Are found in the job context, such as working conditions, interpersonal relations, organisational policies and salary.