In a Fraunhofer’s diffraction by a slit, if slit width is a, wavelength is , focal length…
Physics · JEE Main · NTA Exams — Optics
In a Fraunhofer’s diffraction by a slit, if slit width is a, wavelength is \(\boldsymbol{\lambda}\), focal length of lens is f, linear width of central maxima is:
- \(\frac{f \lambda}{a}\)
- \(\frac{f a}{\lambda}\)
- \(\frac{2 f \lambda}{a}\)
- \(\frac{f \lambda}{2 a}\)
Answer
(C) 2 f a
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