Light of wavelength 559 nm is used to illuminate normally two glass plates 22.1 cm in length that touch at one end and are separated at the other by a wire of radius 0.026 mm. how many bright fringes appear along the total length of the plates.

M = 222 fringes

Explanation:

given

λ = 559 n m = 559 × 10⁻⁹ m

radius = 0.026 mm = 0.026 ×10⁻³ m

length of the glass plate = 22.1 ×10⁻² m

using relation

 = 221.79  

 = 221 (approx.)

hence no of bright fringe

M = m + 1

   = 221 +1

M = 222 fringes

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