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1. What is a prism?
It is a transparent object in the triangular form with refracting surfaces that separates white light into a spectrum of colours.
2. What is the angle of deviation?
The change in the direction of light is called the angle of deviation.
3. What is the angle of minimum deviation?
The angle of deviation is minimum at a particular incidence. Which is called as the angle of minimum deviation.
4. Will the angle of minimum deviation change, if the prism is immersed in water?
Yes, the refractive index of glass in water is less than the refractive index of glass in air hence of minimum deviation decreases.
5. Does the angle of minimum deviation vary with the colour of light?
Yes, it is minimum for red and maximum for violet.
6. What is dispersion?
The angle of different colour have different wavelength. Hence the refractive index of a material is different for different colour of light. Therefore, dispersion happens.
7. What is Angular Dispersion?
The angle between the emergent rays of any two colours is called ‘angular dispersion’.
8. What is dispersive power?
The dispersive power is defined as the ratio of angular dispersion to the mean deviation.
9. Which Light source should be used to calculate Cauchy’s constant and dispersive power of prism?
Neon or mercury lamp should be used because these experiments need to be done on more than one wavelengths and a monochromatic source like sodium lamp will not serve the purpose.