A laser shined through a diffraction grating with lines that are 1/500 mm apart creates a spectra on a screen. The distance from the center bar to the first side bar is 66 mm. The distance from the diffraction grating to the first side bar is 187 mm. Calculate the wavelength of light (in nanometers) that is being emitted by the laser.

Question

anonymous · Answer

You simply need to plug in the values for a, d,.....ect into the diffraction gration equations... do you know them?

anonymous · Answer

no

anonymous · Answer

dsin(theta)=m*landa and y=Ltan(theta)

anonymous · Answer

O.o lol explain some more?

anonymous · Answer

well use those... where m is equal to (1,2,3,4.....)  and y is the distance between bright fringes...

anonymous · Answer

nice info here! http://www.physics.smu.edu/~scalise/emmanual/diffraction/lab.html

anonymous · Answer

so you need to find theta. given the distance between fringes is 66mm and that the distance from the opening to the 1st fringe is 187mm you can find sin(theta fringe 1). then just multiply by d whihc is 1/500mm. this will give you lambda