The telescope at a small observatory has objective and eyepiece focal lengths re

Question

The telescope at a small observatory has objective and eyepiece focal lengths respectively of 19.4 m and 12 cm. If this telescope is used to view a 1480 m diameter lunar crater on the surface of the moon 3.77 x 10^8 m from the surface of the Earth, determine the following. angular magnification of the telescope size of the first image length of the barrel of the telescope angle subtended at the unaided eye by the lunar crater angle subtended at the eye when the lunar crater is viewed through the telescope

Explanation / Answer

a) Angular magnification; AM = fo/fe

where, fo is the focal length of the objective lens and fe is the focal length of the eye piece

so, AM = 19.4*100/12 = 161.67

d) angle subtended = 57 * size of crater / distance of moon = 57 * 1480/ (3.77*108) = 3.834e-6 rad

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