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in a double-slit experiment, two beams of coherent light traveling different paths arrive on a screen some distance away. what is the path difference between the two waves corresponding to the third bright band out from the central bright band?

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taskmasters
In this case, the path difference in between two waves is two wavelengths. In this double-slit experiment, the two beams of coherent light travels in different paths making the third bright band a destruction. So the difference is 2 wavelengths in between 2 waves. 

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