Flashcards
Diffraction grating
Flashcards do conjunto (7)
- 1With diffraction gratings, we refer to fringes as....Maxima
- 2What is the difference between the patterns produced by diffraction grating and the patterns produced by a double slit?The maxima are much sharper
(actual pattern is same) - 3The slit separation on diffraction gratings compared to double slits is usually much....Smaller , therefore maxima separation is much larger
- 4How would we calculate the slit separation in metres (symbol d)Lets use the value of 300 lines per mm
Multiply this by 1000 to get in metres
Do 1/answer for slit seperation
(300mm = 300000m , 1/300000 = 3.3x10^-6m) - 5Diffraction grating formula :dsinθ = nλ
(d = slit separation)
(θ = angle between maximum and n=0 line)
(n = order of maximum)
(λ = wavelegth) - 6Diffraction grating diagram:
- 7Maxima separation (top = monochromatic light , bottom = white light) :
