Two flat plates of glass, each 8.00 cm long, are in contact at one end and are s

Question

Two flat plates of glass, each 8.00 cm long, are in contact at one end and are separated by a piece of paper at the other end, as shown in the figure below. This creates a thin air wedge of variable thickness between the plates. The thickness of the paper is

h = 63.5

Two flat plates of glass, each 8.00 cm long, are in contact at one end and are separated by a piece of paper at the other end, as shown in the figure below. This creates a thin air wedge of variable thickness between the plates. The thickness of the paper is h = 63.5 mu m. What is the thickness t of the air film at a point that is a distance x = 5.70 cm from the end where the plates are in contact? ______cm

Explanation / Answer

Let x = 5.7 cm, D = 8 cm, h=63,5 mu m, t=?

From similitude criteria of triangles, it turns out t : x = h : D => so that t = (h / D) x = 4.5 10^-5 m = 45 mu m.

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