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(d) What is the speed of light in the glass?
(e) With the laser aligned correctly, you can now observe an interference pattern form on the screen a
30cm behind the double-slit. You measure that the m = 1 bright fringe is at an angle
0 = 1.89° from the original direction of the beam. What is the separation between the slits d?
distance D
(f) What are the distances y1 and y2 of the first and second bright fringe (m = 1, 2) from the central
maximum at y = 0?
Hint: You may assume that 0 is small as was seen in class.

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