In Young's double slit experiment the separation 
between the slits is 2 mm, the wavelength 
of the light used is 
and distance 
between the screen and slits is 100 cm. It is found that the angular width of the fringes is 
. To increase the fringe angular width to 0.216 (with same 
and 
) the separation between the slits needs to be changed to
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