Light of wavelength is incident normally on a diffraction grating ruled with

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

Light of wavelength

500\,\text{nm}

is incident normally on a diffraction grating ruled with

600\,\text{lines\,mm}^{-1}

. Calculate the diffraction angle at which the second–order (

m=2

) bright fringe is observed. Give your answer in degrees.