Prism Dispersive Power Quiz
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Questions and Answers

How is the dispersive power of a prism defined?

  • Difference between the deviation suffered by violet and red light
  • Ratio of mean deviation to the angular dispersion suffered by a light ray
  • Difference between the mean deviation of violet and red light
  • Ratio of angular dispersion to the mean deviation suffered by a light ray (correct)

    • What is the angular dispersion defined as?

  • The angular difference between the deviation suffered by the yellow and orange light
  • The angular difference between the deviation suffered by the blue and green light
  • The angular difference between the deviation suffered by the violet and red light (correct)
  • The angular difference between the deviation suffered by the violet and blue light

    • What is the working formula for the refractive index of the material of the prism?

  • $\sin \mu = \left( A + \delta_m \right) \frac{A}{2} \sin \left(\frac{1}{2}A\right)$
  • $\sin \mu = \left( A - \delta_m \right) \frac{A}{2} \sin \left(\frac{1}{2}A\right)$
  • $\sin \mu = \left( A + \delta_m \right) \frac{2}{A} \sin \left(\frac{1}{2}A\right)$ (correct)
  • $\sin \mu = \left( A - \delta_m \right) \frac{2}{A} \sin \left(\frac{1}{2}A\right)$

    • What is the experimental procedure for determining the dispersive power of the material of the given prism?

    <p>Set the prism in the minimum deviation position and take the readings</p> Signup and view all the answers

    What is the formula for the dispersive power of the prism?

    <p>$\omega = \frac{\mu_v - \mu_r}{\mu - 1}$</p> Signup and view all the answers

    What is the aim of the experiment described in the text?

    <p>To determine the wavelength of a monochromatic light using Newton’s Ring method</p> Signup and view all the answers

    What does 'Dm+n' represent in the working formula for determining the wavelength of a monochromatic light?

    <p>Diameter of the (m+n)th ring</p> Signup and view all the answers

    What is the role of the travelling microscope in this experiment?

    <p>To observe and measure the diameter of the bright rings</p> Signup and view all the answers

    What should be done after the preliminary adjustment of the lens position?

    <p>Focus the microscope on to the centre of the ring system</p> Signup and view all the answers

    What is the significance of counting the distinct bright rings in this experiment?

    <p>To determine the wavelength of the monochromatic light</p> Signup and view all the answers

    Study Notes

    Dispersive Power of a Prism

    • Dispersive power of a prism is defined as the angular separation of two extreme wavelengths per unit angular deviation.

    Angular Dispersion

    • Angular dispersion is defined as the angular separation of two extreme wavelengths.

    Refractive Index of Prism Material

    • The working formula for the refractive index of the material of the prism is: μ = sin[(A + D)/2] / sin[A/2]

    Experimental Procedure

    • The experimental procedure for determining the dispersive power of the material of the given prism involves:
      • Preliminary adjustment of the lens position
      • Measuring the angle of deviation using a spectrometer
      • Measuring the angle of minimum deviation using a prism
      • Calculating the refractive index of the prism material
      • Calculating the dispersive power of the prism

    Formula for Dispersive Power

    • The formula for the dispersive power of the prism is: ω = (dx/dλ) × (A/2)

    Aim of the Experiment

    • The aim of the experiment is to determine the dispersive power of the material of the given prism.

    Wavelength of Monochromatic Light

    • 'Dm+n' in the working formula for determining the wavelength of a monochromatic light represents the difference between the m-th and (m+n)-th order of the spectrum.

    Role of Travelling Microscope

    • The travelling microscope is used to measure the angle of deviation accurately.

    Preliminary Adjustment

    • After the preliminary adjustment of the lens position, the prism should be rotated slowly until the images of the two slits coincide.

    Distinct Bright Rings

    • Counting the distinct bright rings is significant in this experiment as it helps to determine the order of the spectrum and calculate the wavelength of the monochromatic light.

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    Description

    Test your knowledge of laboratory experiments with this quiz on determining the dispersive power of a prism. Explore concepts such as refractive index and minimum deviation, and familiarize yourself with the apparatus used in the experiment.

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