Diffraction Grating Flashcards
1
Q
Why use a laser or 2nd slit for any other light source?
A
So only monochromatic light travels through the double slit / diffraction grating (as light travels in a straight line only)
2
Q
What is a ‘coherent’ light source?
A
Light of a constant / fixed phase difference
3
Q
How are fringes formed?
A
From constructive / destructive interference represented on a screen (of which the diffracted light should be traveling to)
4
Q
What is the equation related to diffraction grating?
A
nλ = dsinθ
Where: n = nth order (always an integer) λ = Wavelength of light [m] d = Space between diffracted light [m] θ = Angle between central path and nth order light
5
Q
How do you increase the wavespread of diffracted light?
A
> Use a smaller slit size
> Increase the wavelength (distance between wavefronts)
