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.
Consider the effect on the angular separation of the fringes in a Young's double slit experiment due to the following operations:
(A) the screen is moved away from the plane of the slits,
(B) the separation between the two slits is increased till fringes are observed.
Which of the following options is correct?
- It remains constant in both cases.
- It decreases in both cases.
- It remains constant in (a) but decreases in (b).
- It decreases in (a) but remains constant in (b).
Answer
(C) It remains constant in (a) but decreases in (b).
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