Hints:
The hollow prism of glass is filled with the liquid whose refractive index is to be determined. Find the angle of prism and minimum deviation as explained, and calculate the refractive index from same formula.
VIVA VOCE
Q.1. What is the function of a collimator in a spectrometer?
Ans. The collimator produces parallel rays of light.
Q.2. Define the angle of minimum deviation?
Ans. When the angle at which a ray enters the prism from one face is equal to the angle at which it leaves the other face is called the angle of minimum deviation. The angle of minimum deviation has the least value.
Q.3. What are the parts of a spectrometer?
Ans. A spectrometer has three essential parts these are:
(i) collimator (ii) prism table (iii) telescope.