Young's Double Slit (Fringe Width)

📊 intermediate

$$\beta = \frac{\lambda D}{d}$$

Calculates the distance between two consecutive bright or dark fringes in an interference pattern.

Variables & Units

$\beta$

Fringe width

Unit: Meter ($m$)

$\lambda$

Wavelength of light

Unit: Meter ($m$)

$D$

Distance between slits and screen

Unit: Meter ($m$)

$d$

Distance between the two slits

Unit: Meter ($m$)

Key Information

📐 Derived From

Path difference condition for constructive interference.

💡 Example

Calculating screen distance needed for visible fringes.

🔧 Applications

Measuring wavelength of light sources.

⚠️ Constraints

Small angle approximation and coherent sources.

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