Interference fringes are formed by reflection from a thin air wedge by using sodium light of wavelength of 5893 Å When viewed perpendicularly, 12 fringes are observed in a distance of 1cm. Calculate the angle of wedge.

To calculate the angle of the wedge formed by interference fringes when sodium light of wavelength 5893 Å is used, we can apply the formula for the distance between interference fringes:

\[ d = \frac{{\lambda}}{{2 \cdot \cos(\theta)}} \]

Where:
- \( d \) is the distance between fringes,
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