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Spectrum

ICSE · Class 10 · Physics

Step-by-step guide to study Spectrum in ICSE Class 10 Physics. Topics to cover, practice strategy, and time allocation.

44 questions20 flashcards5 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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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 44 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Spectrum after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • The angle of deviation (δ) is the angle between the incident ray and the emergent ray after passing through a prism.
  • Total deviation δ = δ₁ + δ₂, where δ₁ and δ₂ are deviations at each refracting surface.
  • For a small-angled prism: δ = (μ - 1)A

  • Dispersion: The splitting of white light into its seven constituent colours (VIBGYOR) by a prism.
  • The spectrum is the band of seven colours: Violet, Indigo, Blue, Green, Yellow, Orange, Red.
  • Cause: Different wavelengths → different refractive indices → different speeds → different bending.

  • Electromagnetic waves consist of oscillating electric and magnetic fields perpendicular to each other and to direction of propagation.
  • All EM waves travel at c = 3 × 10⁸ m/s in vacuum.
  • EM spectrum in increasing wavelength order: γ-rays → X-rays → UV → Visible → IR → Microwaves → Radio waves.

Common Mistakes to Avoid

A prism CREATES the seven colours of white light — the colours are produced inside the prism.

Violet light deviates MORE than red light because violet is 'stronger' or 'more energetic', so it bends more easily.

Dispersion occurs at BOTH surfaces of the prism, so the spectrum forms twice.

Memory Tips

Order of colours in the visible spectrum (VIBGYOR)

Violet deviates most, Red deviates least through a prism

Refractive index increases as wavelength decreases (μ ∝ 1/λ²)

Dispersion occurs only at the first surface; deviation at both surfaces

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Frequently Asked Questions

What are the important topics in Spectrum for ICSE Class 10 Physics?
Spectrum covers several key topics that are frequently asked in ICSE Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Spectrum — ICSE Class 10 Physics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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 12 chapters — ICSE Class 10 Physics Study Plan

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