Overhead projectors use a bright lamp and mirrors to display text or images from a transparency sheet on a wall or screen. If your projector displays a shadow when projecting, you must troubleshoot ...

In most large classrooms, turning the projector on will lower the screen automatically In some large classrooms the screen can be lowered using controls on the touch panel In smaller classrooms, pull ...

XP-E501U model offers 5,000 lumens brightness, dual HDMI inputs and ECO Mode technology for small to medium-sized classrooms ...

It's easier than trying to find eclipse glasses at this point. And better for your eyes than staring directly at the sun. Matt Elliott is a senior editor at CNET with a focus on laptops and streaming ...