PASCO OS-8170A Brewster’s Angle Accessory - Manual (Page 19)

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Model No. OS-8170A Brewster’s Angle Accessory
19
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Sample Data (Blue Laser)
The following Graph display shows polarized light intensity versus angle for blue laser light
having a wavelength of 405 nm.
The Curve Fit dialog box for the blue
laser shows the coefficients of the
quadratic formula of the curve fit.
To find the minimum, set dy/dx equal
to zero for the quadratic formula
Solving for x gives 57.3°.
Curve Fit dialog box for blue laser
dy
dx
------ 2Ax B + 2 0.00164
  0.188
– 0 = = =