2012 Cambridge International AS & A level May June Physics Paper 11 Q. No. 30 (9702/11/M/J/12) by Sajit Chandra Shakya from Nepal Chapter - SUPERPOSITION A diffraction grating is used to measure the wavelength of monochromatic light, as shown in the diagram. The spacing of the slits in the grating is 1.00× 10–6m. The angle between the first order diffraction maxima is 70.0°. What is the wavelength of the light? A 287nm B 470nm C 574nm D 940nm