1.The Celestar 8 telescope available in the Physics Lab isdescribed on Blackboard. The primary mirror of a Celestar 8 has anaperture of 203 mm, and the secondary mirror that blocks theprimary mirror has a diameter of 70 mm. The focal length of theprimary mirror is 2032 mm. Using this information calculate thefollowing:

a) [2 marks] The fraction of the incoming light blocked by thesecondary mirror.

b) [3 marks] The light gathering power of the Celestar 8telescope, relative to the human eye with a pupil size of 7 mm, ineach of these cases: i) Taking into account that the secondarymirror blocks some of the incoming light. ii) Ignoring the blockageof light by the secondary mirror.

c) [2 marks] The resolution of the telescope under idealconditions (no air turbulence) measured in seconds of arc. Assumethat you are observing with the visible wavelength of 550 nm.

d) [2 marks] The diameter, in metres, of the smallest craterthat you can observe on the Moon’s surface with the Celestar 8telescope, assuming ideal seeing conditions (no atmosphericturbulence), visible light with wavelength 550 nm, and the distanceto the Moon found on the course formula sheet.

e) [1 mark] The magnification of the Celestar 8 telescope if a15 mm focal length eyepiece is used.