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Manipal MET2012PhysicsWave Optics

A beam of light of wavelength 600 nm from a source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fring is

Options

  1. A2.4 cm
  2. B2.4 mm
  3. C1.2 mm
  4. D1.2 cm

Correct answer

B. 2.4 mm

Step-by-step solution

The distance between the first dark (minima) fringes on either side of the central maximum is twice the fringe width of either maximum or minimum, i.e., aligned =2 D d & = 2 2 600 10⁻⁹ 1 10⁻³ & =2.4 10⁻³=2.4 ~mm aligned

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