Abstract:
APPARATUS FOR ILLUMINATING A SLIT IS PROVIDED WHEREIN MULTI-WAVELENGTH RADIATION IS CAUSED TO IMPINGE SEQUENTIALLY ON A PLURALITY OF INPUT MEANS. THE MULTI-WAVELENGTH RADIATION EMANATING THEREFROM IS DIFFRACTED AND SELECTED WAVELENGTH COMPONENTS OF THE MULTI-WAVELENGTH RADIATION EMANATING FROM EACH INPUT MEANS IS CAUSED TO IMPING ON A SIGNLE EXIT SLIT. THIS SELECTED WAVELENGTH COMPONENT IMPINGING ON THE EXIT SLIT FROM EACH INPUT MEANS BEING DIFFERENT AND THE SEQUENTIAL ILLUMINTION OF SUCH EXIT SLIT WITH RADIATION FROM EACH OF SUCH INPUT MEANS CAUSING THE VARIOUS SELECTED WAVELENGTH COMPONENTS FROM EACH INPUT MEANS TO BE PRESENTED TO THE EXIT SLIT IN A TIME MULTIPLEX SEQUENCE.