The diameters of the consecutive circles vary as the square
roots of the corresponding number of waves. Therefore, if x is the
fraction of a wave length to be determined, and y the diameter of the
first dark ring, d being the diameter of the ring corresponding to one
wave length, then x = y squared/d squared.
[Illustration:
----- +---+
|c | |
| | |
| | |+-------------------------+
| | || |
| | || |
| | |+-------------------------+ l
| | | 2.
| | | m
| +---+
| ______
| +-------------| |---+
| /\ /\ | +-----------| __|-+ | _
a|/ / / / | | | b | | | | |
S----------/\/__d/ / | | | | | | | | |
/ /| / /-----| |-----------|-| ||||||||||| |
| \/ | | | | | | | | |
_|_ | | | | | | |_|
| : | | +-----------|___|----+ | m
e| : | +-----------------------+
| : |
|_ _| 1.
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