n Physics 2 - November 16,2017 Student Name: Midterm Exam 2 Wave optics, Diffrac
ID: 1786247 • Letter: N
Question
n Physics 2 - November 16,2017 Student Name: Midterm Exam 2 Wave optics, Diffraction Patterns, Polarization, Special Relativity You have 70 minutes to complete the exam. The exam consists of 7 open questions. The best 5 answers for questions 1-6 will be taken into Equations are on pages 5-7 Total number of points: 70. . · account, question #7 is mandatory. . 1. A Young's interference experiment, whose schematic is shown in the figure below, is performed with blue-green laser light. The separation between the slits is 0.500 mm, and the screen is located 3.22 m from the slits. The first bright fringe is located 3.16 mm from the center of the interference pattern. What is the wavelength of the laser light? Hint: Use the approximation sin tan for small angles (10 points) S1 Viewing screenExplanation / Answer
given
d = 0.5 mm = 0.5*10^-3 m
L = 3.22 m
y1 = 3.16 mm = 3.16*10^-3 m
for first bright fringe, y1 = lamda*L/d
==> lamda = y1*d/L
= 3.16*10^-3*0.5*10^-3/3.22
= 4.90*10^-7 m or 490 nm <<<<<<<<<-------------Answer
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