Class 12PhysicsWave OpticsFresnel distance, Diffraction through circular slit, concept of Airy Disc, Rayleigh Criterion of Resolution , Fraunhofer diffraction
MediumIn a Fraunhofer diffraction,light of wavelength $\lambda$ is incident on a slit of width $d$. The diffraction pattern is observed on a screen placed at a distance $D$. If the linear width of the central maximum is equal to two times the width of the slit,then the value of $D$ is:
- A$\frac{d^2}{\lambda}$
- B$\frac{d^2}{2 \lambda}$
- C$\frac{d^2}{3 \lambda}$
- D$\frac{d^2}{4 \lambda}$
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