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 Ao
Wavelength of light used = 4654 Ao
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)
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