The principle of superposition is used to understand the phenomenon of interference of…
Physics · Class 12 · CBSE — Wave Optics
The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at a particular point, the resultant displacement produced by a number of waves is the vector sum of the displacements produced by each wave. Light waves from two coherent sources produce interference pattern. Thomas Young devised a way to obtain two coherent sources using two identical pinholes (S1 and S2) illuminated by a single monochromatic pinhole source S. Using these sources in his experiment known as Young's double slit experiment, Young studied the interference pattern. The pattern consists of alternate bright and dark fringes. The distance between two successive bright or dark finges depends on the distance between S1 and S2, the distance of the screen from the plane of S1 S2 and the wavelength of light used.
Vandana performs Young's double slit experiment by using orange, green and red lights successively. If the fringe widths measured in the three cases are \(\omega_1, \omega_2\) and \(\omega_3\) respectively, then which of the following is correct?
- \(\omega_2>\omega_1>\omega_3\)
- \(\omega_1>\omega_2>\omega_3\)
- \(\omega_2>\omega_3>\omega_1\)
- \(\omega_3>\omega_1>\omega_2\)
Answer
(D) _3> _1> _2
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