Optics: Interference Pattern of a Wedge
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Questions and Answers

What is the condition for the formation of an interference pattern in the air wedge experiment?

  • The incident light is polychromatic
  • The incident light is monochromatic (correct)
  • The angle of incidence is 90 degrees
  • The wedge angle is 45 degrees

    • What is the expression for the wedge angle θ in terms of the wavelength λ and fringe width β?

  • θ = 2λ/β
  • θ = λ/β
  • θ = λ/2β (correct)
  • θ = β/λ

    • What is the purpose of the condensing lens in the air wedge experiment?

  • To render the light parallel (correct)
  • To focus the light on the air wedge
  • To split the light into its components
  • To absorb the light

    • How is the thickness of the foil related to the wavelength of the monochromatic light and the fringe width?

    <p>t = λβl</p> Signup and view all the answers

    What is the orientation of the plane glass sheet with respect to the vertical?

    <p>45 degrees</p> Signup and view all the answers

    What is the purpose of moving the microscope vertically up and down in the air wedge experiment?

    <p>To make the fringes visible and parallel</p> Signup and view all the answers

    What is the reason for the two reflected rays being coherent in the air wedge experiment?

    <p>Because they are produced through the division of amplitude of the parent ray</p> Signup and view all the answers

    What is the shape of the air film in the air wedge experiment?

    <p>Wedge-shaped</p> Signup and view all the answers

    What happens to the light when it is incident on the air wedge from above?

    <p>It gets partially reflected from the glass to air boundary</p> Signup and view all the answers

    What is the purpose of the thin foil or wire in the air wedge experiment?

    <p>To separate the two microscope slides</p> Signup and view all the answers

    What is the nature of the interference pattern produced by a thin film of variable thickness?

    <p>Not specified in the text</p> Signup and view all the answers

    What is the thickness of the thin foil being measured in the air wedge experiment?

    <p>It is being measured in nanometers</p> Signup and view all the answers

    What is the direction of the magnetic field at a point along the axial line of a bar magnet?

    <p>Perpendicular to the horizontal component of Earth's magnetic field</p> Signup and view all the answers

    What is the restoring torque τR responsible for?

    <p>Restoring the magnet to its original orientation</p> Signup and view all the answers

    What is the condition for a Tan A position to be achieved?

    <p>The magnetic field is perpendicular to the horizontal component of Earth's magnetic field</p> Signup and view all the answers

    What is the direction of the arms of the deflection magnetometer in a Tan A position?

    <p>East-West direction</p> Signup and view all the answers

    What causes the magnetic needle to deflect through an angle θ in a deflection magnetometer?

    <p>The action of both the magnetic field due to the bar magnet and the horizontal component of Earth's magnetic field</p> Signup and view all the answers

    What is the deflecting torque τD responsible for?

    <p>Deflecting the magnet from its original orientation</p> Signup and view all the answers

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