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Is it possible for a double slit experiment to create an interference pattern at 90 degrees?

Yes, it is possible. In the Fraunhofer approximation you have $$ I(\theta) \propto \cos^2 \left [{\frac {\pi d \sin \theta}{\lambda}}\right]~\mathrm{sinc}^2 \left [ \frac {\pi b \sin \theta}{\lambda} ...
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