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KCET2008PhysicsWave Optics

In a Fraunhofer diffraction experiment at a single slit using a light of wavelength 400 ~nm , the first minimum is formed at an angle of 30^ . The direction of the first secondary maximum is given by

Options

  1. A⁻¹ ( 2 3 )
  2. B⁻¹ ( 3 4 )
  3. C⁻¹ ( 1 4 )
  4. D⁻¹ ( 2 3 )

Correct answer

B. ⁻¹ ( 3 4 )

Step-by-step solution

For first diffraction minimum aligned a &= a &= aligned For first secondary maximum a ^ = 3 2 or ^ = 3 2 1 a = 3 2 = 3 2 30^ = 3 4 or ^ = ⁻¹ ( 3 4 )

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