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I use the Snell's equation:

[tex]n_1sin\Theta_1=n_2sin\Theta_2[/tex]

Hmm... I got 0.22 degrees. Is that correct?

I have another simple conceptual question:

An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature triples?

I guess it is 3 times the volume... or is it 1/3 the volume?

[tex]PV=nRT[/tex]