# A wedged shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope. - Applied Physics 2

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.

#### 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 A

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