Interference of Coherent Light
The two new light waves form bands, these bands are called interference fringes.
This series shows a bright central fringe with a series of dark and bright fringes on either side.
Wavelength of Light
Wavelength of Light Young’s double-slit experiment can be used to find the wavelength of light. The distance between the two slits and between the barrier and the screen are kept constant. At points P 1 P 1 and P 2 P 2 , there are bright bands on both sides. But, the distance ¯ ¯¯¯¯¯¯¯¯¯ ¯ S 2 P 1 S 2 P 1 ¯ is longer than ¯ ¯¯¯¯¯¯¯¯¯ ¯ S 1 P 1 S 1 P 1 ¯ by a wavelength λ � which makes the two waves in phase at P 1 P 1 . At point P 0 P 0 , the phase angle between the two waves is zero. Therefore, a central bright band appears. Large Triangle The angle theta in this right triangle can be calculated using trigonometry. tan θ tan � = x L Small Triangle The point P 1 P 1 is located at the center of the first bright fringe. The path difference between the two wavefronts is: λ = ¯ ¯¯¯¯¯¯¯¯¯ ¯ S 2 P 1 − ¯ ¯¯¯¯¯¯¯¯¯ ¯ S 1 P 1 wavelength from double-s...
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