As you may have learned when studying the properties of thermal energy, building

Question

As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy ("heat") from entering/exiting the building. Although effective as insulators, such windows present interesting optical effects. In the figure, a double-glazed window comprises two identical panes of glass (n_g = 1.40) separated by an air gap. If the light encounters the glass at an angle of 40.00degree with respect to the glass, find the shift in path Deltax as the light enters the room. (Use n_a = 1.00)

Explanation / Answer

na sin(a) = ng sin(g)

1.00 sin(50) = 1.40 sin(g)

==> g = 33.173394 degrees

62 tan(33.173394) + 49.6 tan(40) + 62 tan(33.173394) = 140.17209 mm

(62 + 49.6 + 62) tan(50) = 206.8884 mm

206.8884 - 140.17209 = 66.71631 mm

dx = 66.71631 cos(50) = 42.88 mm

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