Question: An air wedge such as that shown in Fig. 24.30 can be used to measure small dimensions, such as the diameter of a thin wire.

An air wedge such as that shown in Fig. 24.30 can be used to measure small dimensions, such as the diameter of a thin wire.

(a) If the top glass plate is illuminated with monochromatic light, the interference pattern observed will be (1) bright, (2) dark, (3) bright and dark lines based on the air film thickness. Explain.
(b) Express the locations of the bright interference maxima in terms of wedge thickness measured from the apex of the wedge.

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