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A parrallel beam of light (lambda=5000Å)...

A parrallel beam of light `(lambda=5000Å)` is incident at an angle `alpha=30^(@)` as shown in YDSE experiment. Intensity due to each slit at any point on screen in `I_(0)`. The distance between slits is 1mm. The intensity at central point O on the screen is `KI_(0)`. Find the value of K.

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