You need to build a alexandrite laser running at its 720 nm line in tem00 the laser has a resonator length of 0.804m and mirror radii of r7.341 m and r2- 3.347 m (a) is the cavity stable? (1 mark) (b) in order to use the laser in an optical system you need to locate the waist within the cavity and its spotsize. (3 marks) (c) you also must determine the spot size and divergence angle at the output for the laser. (3 marks)

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is