Linear Position First Diffraction Minimum — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Intensity Through Polarizers This formula describes the intensity of light transmitted through a series of n polarizers, where the relative angle between adjacent polarizers is non-zero. Start with Malus's Law for two polarizers: I 2 = I 0 2( 2 - 1) . For three polarizers, the intensity I 3 is found by applying Malus's Law sequentially using the relative angle 23 = | 3 - 2| . The general formula involves the product of the cosine squared of the relative angles between all adjacent polarizers. The factor of 1/2 accounts for the initial reduction in intensity after the first two polarizers. n 2 (at least two polarizers are required) I 0 > 0 Assuming the total intensity is proportional to the cosine of the sum of all relative angles, rather than the product. Forgetting that the formula requires the relative angle between adjacent polarizers, not the angle between the first and last. Confusing the intensity I n with the position of a diffraction minimum.