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Q. Why the centre of Newton's rings pattern appears dark?
The thickness of the air film becomes zero at the point of contact of lens L with glass plate P. Therefore there is no path difference between the interfering waves. So it must appear bright. However the wave reflected from the denser glass plate has suffered a phase change of π while the wave reflected at the spherical surface of the lens has not suffered any phase change. Therefore the point O appears dark.
In mechanics, stress is a measure of the internal forces acting within a deformable body. Quantitatively, it is a measure of the average force per unit area of a surface within the
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Electric current may be expressed in which one of the following units? a) coulombs/volt b) joules/coulomb c) coulombs/second d)
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Differentiate between displacement current and conduction current.
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