The figure shows the light intensity on a screen behind a double slit. The slit spacing is 0.20 and the wavelength of the light is 600 .What is the

The figure shows the light intensity on a screen behind a double slit. The slit spacing is 0.20 and the wavelength of the light is 600 .What is the distance from the slits to the screen?A diffraction grating with 750 slits per mm is illuminated by light which gives a first-order diffraction angle of 34.0. What is the wavelength of the light?A 500 lines per mm diffraction grating is illuminated by light of wavelength 510 . How many diffraction orders are seen? What is the angle of each diffraction order?