Positive charge on a  positively charged
zinc plate was found to be further enhanced when it was illuminated by
ultraviolet light From these observations he concluded that negatively
charged particles were emitted from the zinc plate under the action of
ultraviolet light After the discovery of the electron in 1897, it became evident that the
incident light causes electrons to be emitted from the emitter plate Due
Rationalised 2023-24
277
Dual Nature of Radiation
and Matter
to negative charge, the emitted electrons are pushed towards the collector
plate by the electric field