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 578 nm passes through two slits that are separated by 4.1 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 3.9 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 1.15 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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