The ideal shape for the primary mirror of a telescope is
a. concave circular.
b. convex circular.
c. concave parabolic.
d. convex parabolic.
e. plane.
c
You might also like to view...
Olympus Mons and Maxwell Mons are both:
A) large features on the surface of Mars. B) features visible from Earth. C) dormant volcanoes. D) shield volcanoes. E) the two largest known volcanoes in the solar system.
Diffraction is evident when a wave passes
A) through a small opening. B) the edge of an object. C) both of these D) neither of these
In an ideal transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?
A) 458 B) 240 C) 110 D) 22
An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero
What is the magnitude of the orbital angular momentum L of the atom? A) 1.4? B) 2.0? C) 1.7? D) 1.0? E) 1.2?