Shortcut Methods
Numerical - JEE Exam
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Single Slit Diffraction
- Use the formula $$W=\frac{2\lambda L}{a}$$ to find the the width of the central bright fringe.
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Circular Aperture Diffraction
- Use the formula $$r=\frac{1.22\times\lambda L}{D}$$ to find the radius of the first dark ring.
Numerical- CBSE Board Exam
-
Single Slit Diffraction
- Use the formula $$\theta=\frac{\lambda}{a}$$ to find the the angular width of the central bright fringe.
-
Circular Aperture Diffraction
- Use the formula $$r=\frac{1.22\times\lambda L}{D}$$ to find the radius of the first dark ring.
