Which of the following career roadblocks is completely out of your control

How do you tell if someone actually cares about you? and just say they do?

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?

What is the technical name for super glue type adhesives?