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Prism Spectrometer

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1. What is the angle of deviation?

  • The angle of deviation is the angle between the incident ray and emergent ray.
  • The angle between the incident ray and the normal
  • The angle between the emergent ray and the prism base
  • The angle of refraction inside the prism

2. What is angle of minimum deviation?

  • It is the angle when total internal reflection occurs
  • It is the smallest possible angle of deviation for a prism, occurring when the angle of incidence equals the angle of emergence and the ray passes parallel to the base of the prism.
  • It occurs when light passes undeviated through a prism
  • It happens only when the prism angle is 90°

3. What is dispersion?

  • The phenomenon of splitting of white light into its component colours on passing through a refracting medium.
  • The scattering of monochromatic light
  • The absorption of light into a prism
  • The reflection of light at the surface of a prism

4. What is angular dispersion?

  • The angular separation between the two extreme colours (violet and red) in the spectrum.
  • The intensity difference between the spectral lines
  • The bending of all colours at the same angle
  • The deviation of light inside a prism

5. What is dispersive power?

  • The speed at which light travels through a medium
  • The power of a prism to focus light
  • The amount of light absorbed by a prism
  • It is the ratio of angular dispersion to the mean deviation, representing a prism material’s ability to separate different wavelengths.

6. What does the formula i + i' = A + δ represent?

  • It determines the critical angle for total internal reflection
  • It relates the angle of incidence and emergence to the angle of prism and the angle of deviation.
  • It calculates the refractive index of the prism
  • It measures the angle between the prism faces

7. What does the equation r + r' = A indicate in prism optics?

  • It applies only to right-angled prisms
  • It shows the relationship between angle of incidence and deviation
  • It shows that the sum of the internal angles of refraction equals the prism angle.
  • It is used to calculate the angle of minimum deviation

8. What happens to a light ray passing through a prism?

  • It reflects back into the original medium
  • It travels straight through without deviation
  • It bends towards the base of the prism due to refraction.
  • It always bends away from the base

9. When is the deviation produced by a prism maximum?

  • When the ray enters perpendicularly to the surface
  • When the angle of incidence is 90 degrees.
  • When the angle of incidence is 45 degrees
  • At the angle of minimum deviation

10. Why is a prism set at minimum deviation for spectral analysis?

  • To obtain a pure spectrum by avoiding overlapping of colours.
  • To reflect all light rays back
  • To maximize the number of visible colours
  • To reduce the intensity of light