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AP EAMCET202120 Aug 2021Morning ShiftPhysicsWave OpticsActual

The position of the direct image obtained at O , , when a monochromatic beam of light is passed through a plane transmission grating at normal incidence is shown in figure. The diffracted images A , B and C correspond to the first, second and third order diffraction. When the source is replaced by another source of shorter wavelength

Options

  1. Aall the four will shift in the direction C to O
  2. Ball the four will shift in the direction O to C
  3. Cthe images C,B and A will shift towards O
  4. Dthe images C,B and A will shift away from O

Correct answer

C. the images C,B and A will shift towards O

Step-by-step solution

If d   is the distance between slits and θ   is the angle between 0 th order maxima and n th   order maxima, then for diffraction pattern d sin θ = n λ Now, if the source is replaced by another source of shorter wavelength, then sin θ   becomes smaller. Therefore, the angle of diffraction for all orders reduces due to which the pattern shrinks and images move towards the normal, not diffracted beam. Hence, the images C,B and A will shift towards O

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