Building a Laser - Brewster's Angle Problem

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To build a laser using a MgF2 window for 310 nanometer light, the Brewster's angle must be calculated to minimize reflection. The Brewster's angle (θB) is found to be approximately 53.95 degrees, which is essential for proper orientation. The window should be positioned to ensure that the output light is polarized in the vertical plane. The discussion raises questions about whether the problem involves more complexity beyond just calculating the angle. Understanding the orientation of the window is crucial for achieving the desired polarization.
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Homework Statement



You are making a laser with light of wavelength 310 nanometers using a MgF2 window (which will transmit the UV). The mirrors will be external so each end of the 'pumping' gas discharge tube must be cut at Brewster's angle so that there is no reflection from the surface as the light passes through it. Calculate the proper angle and state how to orient the part so that the output is polarized in the vertical plane.

Homework Equations



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The Attempt at a Solution



θB = arctan(1.374) = 53.952 degrees

Is this really all this problem is? Just finding the Brewster's angle, and that's the answer? Or is there something more complex that I'm missing here?
 
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You also have to say how the window is oriented.
The Wikipedia article on Brewster angle shows this.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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