(a) A wedge-shaped film of air is formed between two, thin, parallel-sided, glass plates by means of a straight piece of wire. The two plates are in contact along one edge of the film and the wire is parallel to this edge. (1) Draw and label a diagram of the experimental arrangement you would use to observe and make measurements on interference fringes produced with light normally incident on the fim. (ii) Explain the function of each part of the apparatus.
(a) A wedge-shaped film of air is formed between two, thin, parallel-sided, glass plates by means of a straight piece of wire. The two plates are in contact along one edge of the film and the wire is parallel to this edge. (1) Draw and label a diagram of the experimental arrangement you would use to observe and make measurements on interference fringes produced with light normally incident on the fim. (ii) Explain the function of each part of the apparatus.
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Answer B
Transcribed Image Text:(a) A wedge-shaped film of air is formed
between two, thin, parallel-sided, glass
plates by means of a straight piece of wire.
The two plates are in contact along one
edge of the film and the wire is parallel to
this edge.
(1) Draw and label a diagram of the
experimental arrangement you
would use to observe and make
measurements
on interference
fringes produced with light normally
incident on the fiim.
(ii) Explain the function of each part of
the apparatus.
(b) In such an experiment using light of
wavelength 589 nm, the distance be-
tween the seventh and one hundred and
sixty-seventh dark fringes was 26.3 mm
and the distance between the junction of
the glass plates and the wire was 35.6 mm.
Calculate the angle of the wedge and the
diameter of the wire.
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