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Chapter Summary

Spectrum — Chapter Summary

ICSE · Class 10 · Physics

Summary of Spectrum for ICSE Class 10 Physics. Part of the ICSE Class 10 Physics syllabus. Spectrum is the band of colours formed when white light passes.

43 questions33 flashcards4 formulas & key relations5 concepts

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A comprehensive infographic displaying the entire electromagnetic spectrum, ordered by increasing wavelength and decreasing frequency (or vice-versa). It should include different regions like Gamma ra
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Overview

Spectrum is the band of colours formed when white light passes through a prism and splits into its seven constituent colours. White light is polychromatic light and, according to Newton's concept, it contains seven colours in the order VIBGYOR. A prism produces deviation at both refracting surfaces,

Key Concepts

A ray of light passing through

A ray of light passing through a prism is deviated twice, once at each refracting surface. The total deviation is the sum of these two deviations: δ=δ

The phenomenon of splitting of white

The phenomenon of splitting of white light by a prism into seven colours is called dispersion of light. White light consists of violet, indigo, blue,

The beautiful pattern of seven colours

The beautiful pattern of seven colours obtained after passing white light through a prism is called spectrum. A spectrum is pure when the colour bands

The refractive index of glass increases

The refractive index of glass increases as wavelength decreases, so shorter wavelengths deviate more. Violet light, with wavelength about 4000 Å, suff

Different colours travel with different speeds

Different colours travel with different speeds in a medium because refractive index depends on wavelength. This difference in speed is the main cause

Learning Objectives

  • Understand deviation of light through a prism
  • Explain dispersion of white light into seven colours
  • Distinguish between spectrum, pure spectrum, and impure spectrum
  • Identify the order of colours in white light as VIBGYOR
  • Explain the electromagnetic spectrum and its main regions

Frequently Asked Questions

What are the important topics in Spectrum for ICSE Class 10 Physics?
Key topics in Spectrum include Deviation, Dispersion and Spectrum, Visible Spectrum and Invisible Spectrum, Electromagnetic Spectrum, Properties of Electromagnetic Waves. Study these first, then practise questions on each for the ICSE Class 10 board exam.
How should I revise Spectrum for the ICSE Class 10 board exam?
Learn the core ideas first, then work through the 43 practice questions on Spectrum. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Spectrum

All ICSE Class 10 Physics Chapter Summary

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