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General
Easy
Question
Two point source separated by d = 5 mm emit light of wavelength 
in phase. A circular wire of radius 20 mm is placed around the source as shown in figure.
- Points A and B are dark and points C and D are bright.
- Points A and B are bright and point C and D are dark
- Points A and C are dark and points B and D are bright
- Points A and C are bright and points B and D are dark
The correct answer is: Points A and C are bright and points B and D are dark
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In the figure shown, S is a point monochromatic light source of frequency 
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