A source of laser light sends rays ab and ac toward two opposite walls of a hall. The light rays strike the walls at points b and c, as shown below:.

When your working with the passage-based reading questions on the psat do all of the following except. a)make sure you read each question throughly. b) try to answer each question before you look at the answers. c) plan to spend most of your time reading the passage. d) make sure your answer choice is the most correct number me