The fringe width $\beta$ in Young's double-slit experiment is given by:
$$\beta = \frac{\lambda D}{d}$$Given values in standard SI units:
- Wavelength $\lambda = 600\,\text{nm} = 600 \times 10^{-9}\,\text{m} = 6 \times 10^{-7}\,\text{m}$
- Screen distance $D = 1.2\,\text{m}$
- Slit separation $d = 1.5\,\text{mm} = 1.5 \times 10^{-3}\,\text{m}$
Substituting:
$$\beta = \frac{(6 \times 10^{-7}\,\text{m})(1.2\,\text{m})}{1.5 \times 10^{-3}\,\text{m}} = \frac{7.2 \times 10^{-7}}{1.5 \times 10^{-3}} = 4.8 \times 10^{-4}\,\text{m} = 0.48\,\text{mm}$$
यंग के द्वि-झिरी प्रयोग में फ्रिंज चौड़ाई का सूत्र:
$$\beta = \frac{\lambda D}{d}$$दिए गए मान:
$\lambda = 600 \times 10^{-9}\,\text{m}$, $D = 1.2\,\text{m}$, $d = 1.5 \times 10^{-3}\,\text{m}$
मान रखने पर: