Numerical

A wedged shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope. The distance measured between consecutive fringes is 0.12 cm. Calculate wavelength of light used.

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#### Solution

β = 0.12 cm

θ = 40 seconds = 1.9392 x 10^{-4} radians

`β = λ/(2θ)`

λ = β x 2θ

= 0.12 x 2 x 1.9392 x 10^{-4}

= 4654 A^{o}

Wavelength of light used = 4654 A^{o }

Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)

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