13. Depending upon its wavelength, light from a fluorescent lamp or the Sun will

Question

13. Depending upon its wavelength, light from a fluorescent lamp or the Sun will undergo constructive or destructive interference when it bounces off an oil slick or very thin (1 micrometer) piece of flat glass. (Such a film-like piece of glass is called a pellicle). But the same light will not undergo interference if the glass sheet ?s much thicker than a few 10?s of micrometers even if the thicker glass ?s equally flat and transparent. However, a laser will produce interference effects in flat glass plates that are as much as 1 cm thick. Explain these phenomena.

Explanation / Answer

Interfernce is produced when the width of the material is of comparison with the wavelength of light. Light from fluorescent lamp can not undergo interferece in 10 mm glass since width is not in compasicon withe wavelength.

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