Discuss the relevant features of a photomultiplier including the following: construction - principle of operation - explain what is meant by responsivity. plot an example responsivity of a photomultiplier as a function of wavelength - applications of photomultipliers b) (10 marks) discuss the relevant features of a photodiode including the following: construction principle of operation. include a suitable circuit diagram these photodiodes require to operate. schematic responsivity as a function of wavelength - applications