Aim:
To determine the angle of the given prism.
Apparatus:
Spectrometer, prism, magnifying glass, sodium vapor lamp.
Principle:
When a beam of light strikes on the surface of transparent material (Glass, water, quartz crystal etc.), a portion of the light is transmitted and the other portion is reflected. When a beam of light strikes on a plane surface, the angle of reflection will be the same as angle of incidence.
Fig (1)
![](/userfiles/1/image/spectrometer/spect2.JPG)
![](/userfiles/1/image/spectrometer/spectr3.JPG)
Fig (2) Fig (3)
If the angle between two reflected ray is measured as θ, then the angle of the prism is
A= θ/2