Prelab Brief
To study the refraction and dispersion of white light through a glass prism, observe the formation of a spectrum, and verify Snell's law at both refracting surfaces.
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Theory
Study refraction and dispersion of white light through a glass prism. To study the refraction and dispersion of white light through a glass prism, observe the formation of a spectrum, and verify Snell's law at both refracting surfaces.
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Formula
The deviation angle D = (i + e) − A
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Aim
To study the refraction and dispersion of white light through a glass prism, observe the formation of a spectrum, and verify Snell's law at both refracting surfaces.
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Apparatus
- Glass prism (equilateral, 60°)
- Ray box or laser pointer
- White screen
- Protractor
- Drawing board with white paper
- Pins
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Procedure
- Place the prism on the drawing board and trace its outline.
- Direct a narrow beam of white light at one face of the prism.
- Observe the refracted ray exiting from the other face.
- Mark the incident and emergent rays using pins.
- Measure angles of incidence (i), emergence (e), and deviation (D).
- Switch to white light and observe the VIBGYOR spectrum on screen.
- Vary the angle of incidence and plot i vs D graph to find minimum deviation.
Pre-Lab Questions
What is the main aim of the Prism Refraction & Dispersion Experiment?
Which principle is demonstrated in the Prism Refraction & Dispersion Experiment?
What apparatus is required for this experiment?
Why is Glass prism (equilateral, 60°) used in this experiment?
What formula or relationship is verified in this experiment?
What precaution should be followed while performing this experiment?
What conclusion can be drawn from the Prism Refraction & Dispersion Experiment?