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Keith_Richards [23]
3 years ago
5

The second-order dark fringe in a single-slit diffraction pattern is 1.40 mm from the center of the central maximum. Assuming th

e screen is 89.0 cm from a slit of width 0.710 mm and assuming monochromatic incident light, calculate the wavelength of the incident light.
Physics
1 answer:
34kurt3 years ago
4 0

We know, for single slit :

y =\dfrac{ n\lambda L}{a}\\\\\lambda = \dfrac{ya}{nL}       ...1)

y = 1.4\ mm = 1.4 \times 10^{-3}\ m

n = 2

L = 89 cm = 0.89 m

a=7.1\times 10^{-4}\ m

Putting all these in equation 1), we get :

\lambda = \dfrac{ya}{nL}\\\\\lambda = \dfrac{1.4\times 10^{-3}\times 7.1\times 10^{-4}}{2\times 0.89 }\\\\\lambda = 5.584 \times 10^{-7}\ m

Therefore, wavelength of the incident light is 5.584 \times 10^{-7}\ m or 558.4 nm.

Hence, this is the required solution.

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