to determine the wavelength of light using (1) a double-slit, and (2) a diffraction grating Flashcards
1
Q
What does the source of light need to be?
A
Monochromatic (one colour)
2
Q
How is the light diffracted?
A
Single slit.
3
Q
How is the two waves made coherent?
A
Double slit.
4
Q
What is D?
A
screen-slit distance
5
Q
What is a?
A
slit separation
6
Q
What is x?
A
bright fringe separation
7
Q
What is the formula of the double-slit experiment?
A
lamda = ax / D
8
Q
What happens when light passes a diffraction grating?
A
It splits into a series of beams.
9
Q
What is d?
A
grating spacing
10
Q
What is n?
A
nth order
11
Q
What is the grating equation?
A
d sin(theta) = n lamda
12
Q
How to convert lines per metre to grating spacing.
A
1/lines per metre = grating spacing
