a.You shine an orange laser (639 nm) on a double slit in an experiment you perform in your physics lab. Measuring with a protractor you see that the interference pattern makes the first fringe at 19.0° with the horizontal. What is the separation between the slits?  ______________m b.What is the separation between two slits for which 620 nm light has its first minimum at an angle of 30.1°?  __________________m

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.