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Coherent light of a single frequency passes through a double slit with a  separation d, to produce a pattern on a screen as distance D from the slits.  What would cause the separation between adjacent minima on the screen to  increase?
A. A. increase the index of refraction of the medium in which the  setup is immersed
B. increase the separation d between the slits
C. increase the distance  
D. increase the frequency of the incident light
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1 Answer

B. increase the separation d between the slits
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