Use what you know about multiple slit interference and what you$$ve learned about diffraction gratings to answer the following questions.

If you have a diffraction grating with $1000$ lines per mm$,$ what is the separation between two slits?Answer.

d$=11000$mm

At what angle will the second$-$order maximum be if you shine a light through the diffraction grating with a wavelength of $475$ nm$?$Answer.

$=72$

What happens to the diffraction pattern if the wavelength increases? If it decreases?

Now consider what happens if you have white light passing through your diffraction grating. How does a diffraction grating affect redder colors? How does it affect bluer colors? Predict what you might see on the screen.