Why Cathode rays come out at right angles to the surface of the cathode ?

cathode rays caste shadows of solid objects placed in their path. 2.when allowed to fall on a light paddle wheel placed in thair path ;they cause rotation of the wheels. 3.cathode rays are attracted to the +ve when 2 charged plates are placed on either of their side. 4.cathode rays get deflected in magnetic field in a direction as to indicate that they are -vely charged. 6.they ionise the gas through which they pass.

Thank You
Ruchi
Askiitians Faculty