Quick Answer: The Spectrometer Prism is a 25 mm clear glass equilateral prism with 60° angles and optically polished faces, used for refraction, dispersion, prism-angle and refractive-index experiments.
Last updated: October 2026
Key Features
Equilateral triangular prism with 60° x 60° x 60° angles.
Size 25 mm x 25 mm for spectrometer and ray-optics work.
Optically polished faces for observing refraction and dispersion.
Approximate refractive index of 1.52 for classroom calculations.
Used to find the prism angle, angle of deviation and minimum deviation.
Technical Specifications
Specification
Value
Size
25 mm x 25 mm
Angles
60° x 60° x 60°
Material
Clear glass
Prism type
Equilateral triangular
Faces
Optically polished
Refractive index
1.52 approx.
About This Product
Placed on a spectrometer table or optics setup, the prism is aligned so light enters one polished face, and the telescope or viewing arrangement is adjusted to observe the refracted ray. Students measure the prism angle or deviation angle, repeat the readings and use them to calculate refractive index by the minimum deviation method, or to study how white light separates into a visible spectrum.
Frequently Asked Questions
Q1. Can the prism be used without a spectrometer? Yes. Besides spectrometer work, it supports ray-optics experiments with a ray box or optical bench.
Q2. How should the prism be handled? Hold it by its edges, avoid touching the polished faces unnecessarily and clean it only with a soft, dry optical cloth.
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