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Lelu [443]
3 years ago
15

Monochromatic light passes through a double slit, producing interference, the distance between the slit centres is 1.2 mm and th

e distance between constructive fringes on a screen 5 m away is 0.3 cm. What is the wavelength?
Physics
1 answer:
Alik [6]3 years ago
8 0

Answer:

The wavelength of the light is 7200\ \AA.

Explanation:

Given that,

Distance between the slit centers d= 1.2 mm

Distance between constructive fringes \beta= 0.3\ cm

Distance between fringe and screen D= 5 m

We need to calculate the wavelength

Using formula of width

\beta=\dfrac{D\lambda}{d}

Put the value into the formula

0.3\times10^{-2}=\dfrac{5\times\lambda}{1.2\times10^{-3}}

\lambda=\dfrac{0.3\times10^{-2}\times1.2\times10^{-3}}{5}

\lambda=7.2\times10^{-7}\ m

\lambda=7200\ \AA

Hence, The wavelength of the light is 7200\ \AA.

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