I just want to make sure i got these questions answered correctly about multiple slit diffraction gratings: specifically a grating spectroscope. 1. Why is the 2nd order spectrum more "spread out" than the first order spectrum? Is it because one light wave has to travel 2 wavelengths farther than the other wave of light? Also because the angle increases as you move from the first order to the second order spectrum? 2. Explain why it is important to illuminate as much of the grating as possible. Is it because you need as much light as possible to produce mth order maximums. If there is not enough light then some maximums wont show up. Please help with anything i left out, should add, or did wrong. thanks.