4. The interference pattern caused by a transmission grating placed in front of a diode laser (2= 660 nm) is shown (top view) below, where the dots indicate bright red spots on the screen. laser 40 cm grating 80 cm screen 6 cm a) Calculate the separation distance, d, between adjacent slits on the grating. b) Calculate the number of slits per centimeter, on the grating.

4. The interference pattern caused by a transmission grating placed in front of a diode laser (2= 660 nm) is shown (top view) below, where the dots indicate bright red spots on the screen. laser 40 cm grating 80 cm screen 6 cm a) Calculate the separation distance, d, between adjacent slits on the grating. b) Calculate the number of slits per centimeter, on the grating.