In the experimental set up to observe diffraction pattern of a straight edge, the distance of the edge from the source is 30 cm and the distance of the screen from the edge is 40 cm. The wavelength of the light used is 480 x 10–5 cm. Calculate the position of the first and third minima from the edge of the geometrical shadow.

To calculate the position of the first and third minima from the edge of the geometrical shadow in the diffraction pattern of a straight edge, we can use the formula for the angular position of the minima:

\[ \theta_m = \sin^{-1} \left( \frac{m \lambda}{a} \right) \]

Where:
- \( \theta_m \) is the angular position of the \( m^{th} \) minima.
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