Patent ID: 8896815

Claim:
An exposure apparatus, comprising: a projection system configured to project a plurality of radiation beams onto a substrate, wherein the plurality of radiation beams comprises a first group of radiation beams formed from radiation within a first wavelength range and a second group of radiation beams formed from radiation within a second wavelength range, different from the first wavelength range; and a dispersion element, configured such that radiation beams of the first group are incident on the dispersion element at a different angle from radiation beams of the second group and such that the radiation beams of the first and second groups output from the dispersion element are substantially parallel, wherein the radiation beams within each group incident on the dispersion element are arranged in a respective row associated with each group when incident on the dispersion element, and the radiation beams of the first and second groups output from the dispersion element are arranged in a single row when output from the dispersion element.