PhysicsLAB Practice Problems
Double Slit Interference

Directions: On this worksheet you will be investigating the properties of double slit interference patterns.

Question 1  Light of wavelength 536 nm passes through two slits that are separated by 6 µm. At what anglular deviation, as measured from the middle of the central maximum, would the 1st order bright fringes appear on a screen that is 2.2 meters away?
Question 2  What is the linear separation on the screen between adjacent bright fringes?
Question 3  In a totally darkened room, what would be the maximum possible number of bright fringes, including the central maximum, that could be viewed on the screen?
Question 4  Point P has a linear deviation of 0.61 meters above the middle of the central maximum. Is point P located in a bright or dark fringe?
Question 5  If light of the same wavelength were to pass through two slits that were separated further apart, how would the distance between the bright fringes on the screen change?
Question 6  If light of a longer wavelength were to pass through the original two slits, how would the distance between the bright fringes on the screen change?


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