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Question-1. What is a prism?

Answer-1: Prism is an optical medium bounded by three rectangular faces and two triangular faces.

Question-2. What is refracting angle of prism?

Answer-2: The angle between two refracting surfaces is called refracting angle of prism.

Question-3. What types of eye piece is used in spectrometer telescope?

Answer-3: Ramsden's eye piece because it has cross wires so the measurements can be made.

Question-4. Why do the telescope and collimator are adjusted for parallel rays?

Answer-4: When the incident rays are parallel then image is formed at the principal focus of the eyepiece. After dispersion same coloured rays are parallel to one another, different colors should be focused at the different points.

Question-5. What is monochromatic source?

Answer-5: Is sodium light is monochromatic?

Question-6. Is Laser beam is monochromatic?

Answer-6: Yes, Laser beam is monochromatic source.

Question-7. What is dispersion of light?

Answer-7: Splitting up of composite light into its constituent colors when it is passed through some dispersive medium like prism is called dispersion, discovered by Newton.

Question-8. Why should there be no parallax between the image of the slit and that of the cross wires?

Answer-8: When there is no parallax the image of the slit will be coincide with the cross wires. Otherwise there will be relative movement between the two images with the movement of the eyes which in turn introduce error in the readings.

Question-9. On what a factor does the angle of deviation depends?

Answer-9: It depends on the R I of the material of the prism. Wavelength of the incident light, refracting angle of the prism, angle of incidence.

Question-10. Why deviation produced by the prism does is vary with the colour of the light?

Answer-10: The deviation produced depends R I of the material of the prism which is different for different wavelengths. I.e. for different colors.

Question-11. Write the Cauchy's dispersion formula and explain the terms?

Answer-11: Cauchy's formula is, n = A + B / Λ^{2};

Where, n= Refractive Index of the material of the prism

Λ = Wavelength of light used

A and B are Cauchy's constants.

Question-12. Does the Cauchy's constant depend on the dispersive medium?

Answer-12: Yes, A and B are different for different media.

Question-13. Does the Cauchy's constants depends of the dispersive medium depends upon the wavelength of the

Answer-13: Differentiating the Cauchy's formula dn / dΛ = -2B / Λ^{3}

dn / dΛ is the dispersive power of the medium which is inversely proportional to the cube of the wavelength of light.

Question-14. What is angle of minimum deviation?

Answer-14: It is an angle of deviation for which for which the ray passes through the prism symmetrically.

Question-15. Define angular dispersion?

Answer-15: The difference between deviations for any two colors produced by a prism.

Question-16. Define Refractive Index of a Medium?

Answer-16: The dispersive power of a material is the ratio of angular dispersion to the mean deviation.

Question-17. What is a spectrum?

Answer-17: Band of colours (wavelengths) obtained after dispersion.

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