Posted by **confused** on Thursday, January 24, 2013 at 3:28pm.

Which of the following equations describes the condition for observing the fourth bright fringe in Young's double-slit interference pattern? Assume n = 0 for the central bright fringe.

Which of the following equations describe the condition for observing the fourth dark fringe in an interference pattern correctly?

d sinè = ë

d sinè = 3ë/2

d sinè = 3ë

d sinè = 4ë

I was going to say d sinè = 4ë for dark fringe, but then i don't know what it is for bright fringe.

- Physics -
**Elena**, Thursday, January 24, 2013 at 4:11pm
d sinθ = 4λ

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