A beam of light consisting of two wavelengths 
and 
is used to obtain interference pattern in Young's double slit experiment. The distance between the slits is 
and the distance between the plane of slits and the screen is 
. The least distance from the central fringe, where the bright fringes due to both the wavelengths coincide, is 
. The value of 
is___
Text Solution
Verified by Experts462
(462) 
Fringe width 
Let 
bright tringle of 
match with 
bright triangle of 
Distance where bright fringe will match
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