﻿18 
  Dr. 
  W. 
  M. 
  Hicks 
  on 
  the 
  Michehon-Morley 
  

  

  the 
  side 
  on 
  which 
  is 
  the 
  source 
  of 
  light, 
  is 
  

  

  u; 
  = 
  i?sin 
  (j) 
  — 
  wcos 
  <j> 
  = 
  — 
  U 
  cos 
  (<£ 
  + 
  «). 
  . 
  . 
  (.5) 
  

   Similarly 
  that 
  of 
  the 
  second 
  mirror 
  is 
  

  

  w'=v 
  sin^ 
  — 
  ucosx 
  = 
  — 
  U 
  cos 
  (% 
  + 
  #). 
  . 
  . 
  (6) 
  

  

  Fisr. 
  5 
  

  

  7. 
  Ihe 
  Wave-lengths. 
  — 
  With 
  the 
  above 
  notations, 
  the 
  

   final 
  wave-lengths 
  will 
  he 
  by 
  (2), 
  

  

  Xi= 
  

  

  sin 
  <j>' 
  sin 
  (/>/ 
  

  

  sin 
  (<£ 
  4- 
  6) 
  ' 
  sin 
  $, 
  

   sin 
  2 
  ' 
  

  

  X, 
  

  

  sm 
  

  

  X' 
  

  

  sin 
  (%-f 
  0) 
  sin 
  (£ 
  2 
  

   where 
  X 
  is 
  the 
  wave-length 
  incident 
  on 
  the 
  plate. 
  

  

  