Your friend has been given a laser for her birthday. Unfortunately, she did not

Question

Your friend has been given a laser for her birthday. Unfortunately, she did not receive a manual with it and so she doesn't know the wavelength that it emits. You help her by performing a double-slit experiment, with slits separated by 0.18 mm. You find that the distance between the first bright fringe above the central maximum and the first bright fringe below the central maximum is delta y = 5.3 mm. (Figure 1) The screen is 1.4 m away from the slits. What is the value of m in the equation d sin theta = m lambda for the first bright fringe above the central maximum? Express your answer using one significant figure. m = 1 What is the value of m in the equation d sin theta = m lambda for the first bright fringe below the central maximum? Express your answer using one significant figure.

Explanation / Answer

The value of m is -1 for the first bright fringe below the central maximum. It is the first order bright fringe so m=+1 or m=-1 but since it is below the central maximum, the value of m=-1 hence the value of m= -1.

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