(a) Find the two locations where an object can be placed in front of a concave mirror with a radius of curvature of 39 cm such that its image is twice its size. (b) In each of these cases, state whether the image is real or virtual, upright or inverted.
Motions of the Stars and Sun 1. Constellations and Asterisms a. Constellations: one of 88 sections in the sky i. All countries agree on these regions ii. Utility of these regions is that if there is a particular object, you can get a rough idea of where it is in the sky based on what region it is in b. Asterisms: 2. using asterisms to navigate the sky a. Polaris is the most important star (North Star) b. It is very close to the spin axis, so it doesn’t look like it moves, so people use it as a reference point c. Some other famous constellations are the Big Dipper, the small dipper (the North Star is part of this)