10 Questions
How is the dispersive power of a prism defined?
Ratio of angular dispersion to the mean deviation suffered by a light ray
What is the angular dispersion defined as?
The angular difference between the deviation suffered by the violet and red light
What is the working formula for the refractive index of the material of the prism?
$\sin \mu = \left( A + \delta_m \right) \frac{2}{A} \sin \left(\frac{1}{2}A\right)$
What is the experimental procedure for determining the dispersive power of the material of the given prism?
Set the prism in the minimum deviation position and take the readings
What is the formula for the dispersive power of the prism?
$\omega = \frac{\mu_v - \mu_r}{\mu - 1}$
What is the aim of the experiment described in the text?
To determine the wavelength of a monochromatic light using Newton’s Ring method
What does 'Dm+n' represent in the working formula for determining the wavelength of a monochromatic light?
Diameter of the (m+n)th ring
What is the role of the travelling microscope in this experiment?
To observe and measure the diameter of the bright rings
What should be done after the preliminary adjustment of the lens position?
Focus the microscope on to the centre of the ring system
What is the significance of counting the distinct bright rings in this experiment?
To determine the wavelength of the monochromatic light
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.
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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