COMEDK20269 May 2026Evening ShiftPhysicsWave OpticsActual
In a single slit diffraction experiment, the diffraction pattern is observed on a screen placed at a distance of 2m from the slit of 1mm width. If the distance between the first dark fringe on either side of the central to right fringe is 2.2 mm. what is the wave length of the monochromatic light from a distance source, used in this experiment?
Options
- A3900 Å
- B5500 Å
- C11000 Å
- D1100 Å
Correct answer
B. 5500 Å
Step-by-step solution
Given D = 2 m, a = 1 mm = 10⁻³ m. The distance between the first dark fringes on either side of the central maximum is the width of the central maximum, given by 2 D a . 2 D a = 2.2 10⁻³ m 2 2 10⁻³ = 2.2 10⁻³ 4 = 2.2 10⁻⁶ = 0.55 10⁻⁶ m = 5500 10⁻¹⁰ m = 5500 Å Answer: 5500 Å