An electroscope is used to convey a basic concept of the photoelectric effect. UV light discharges a negatively charged zinc plate and the leaves of the electroscope move closer to each other.
An electron beam in a catahode ray tube can be deflected with a magnetic or electric field. An electron beam can cause a pinwheel in a CRT to turn. When an object is placed in the path of an electron beam, the rays cast a shadow.
