Class 12PhysicsWave OpticsFresnel distance, Diffraction through circular slit, concept of Airy Disc, Rayleigh Criterion of Resolution , Fraunhofer diffraction
Medium$A$ Fraunhofer diffraction pattern due to a narrow slit is obtained on a screen placed at a distance $D$ from the slit whose slit width is $a$. The distance of the first secondary maximum from the central maximum is
- A$\frac{3 D \lambda}{a}$
- B$\frac{3 D \lambda}{2 a}$
- C$\frac{2 D \lambda}{3 a}$
- D$\frac{2 D \lambda}{a}$
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