Linear Position First Airy Minimum — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Linear Position of First Airy Minimum This formula describes the approximate linear position of the first minimum in the diffraction pattern produced by light passing through a circular aperture (Airy pattern). The condition for the first minimum in a circular aperture is given by ( 1) = 1.22 a . For small angles (which is often assumed for the first minimum), ( 1) ( 1) . The linear position x 1 is related to the angle by x 1 = f ( 1) . Combining these relations and simplifying the constant factor leads to the approximation x 1 f a . > 0 a > 0 f > 0 Confusing the condition for minima with the condition for maxima. Using the single-slit formula ( x m a ) instead of the full Airy pattern formula which accounts for the circular aperture. Forgetting the focal length f when calculating the position.