Transmission of light is the moving of electromagnetic waves (whether visible light, radio waves, ultraviolet, etc.) through a material. This transmission can be reduced, or stopped, when light is reflected off the surface or absorbed by the molecules in the material.
An FBI agent at GS-12 step 5 would earn an annual salary of  $68,993. More experienced agents with longer tenure will have a higher grade and step rating. An agent at GS-14 step 1 would earn $85,544, while an agent on GS-14 step 4 would have an annual salary of $94,097.
Potential for Advancement. Experienced intelligence analysts have the potential to advance to GS 14 assignments at FBI headquarters in Washington, D.C., or in nonsupervisory assignments at FBI field offices across the country. Salaries at GS 14 range from $84,697 to $110,104 per year. Promotions to supervisory and management positions exist at the GS 15 level, the FBI reports. Annual salaries at GS 15 range from $99,628 to $129,517, according to the 2012 GS Salary Schedule.