Optics: Interference Pattern of a Wedge

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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?

t = λβl (D) Signup and view all the answers

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

45 degrees (A) Signup and view all the answers

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

To make the fringes visible and parallel (B) Signup and view all the answers

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

Because they are produced through the division of amplitude of the parent ray (C) Signup and view all the answers

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

Wedge-shaped (A) Signup and view all the answers

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

It gets partially reflected from the glass to air boundary (D) Signup and view all the answers

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

To separate the two microscope slides (D) Signup and view all the answers

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

Not specified in the text (D) Signup and view all the answers

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

It is being measured in nanometers (B) 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?

Perpendicular to the horizontal component of Earth's magnetic field (B) Signup and view all the answers

What is the restoring torque τR responsible for?

Restoring the magnet to its original orientation (D) Signup and view all the answers

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

The magnetic field is perpendicular to the horizontal component of Earth's magnetic field (A) Signup and view all the answers

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

East-West direction (A) Signup and view all the answers

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

The action of both the magnetic field due to the bar magnet and the horizontal component of Earth's magnetic field (A) Signup and view all the answers

What is the deflecting torque τD responsible for?

Deflecting the magnet from its original orientation (D) Signup and view all the answers