Spectrum
ICSE · Class 10 · Physics
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See them allWhat is deviation of light through a prism and what factors does it depend on?
Answer
Deviation is the bending of light from its original path when passing through a prism. Total deviation δ = δ₁ + δ₂. It depends on: (1) Angle of incidence at first surface, (2) Angle of prism (A), (3) …
Which color deviates maximum and minimum through a prism? Why?
Answer
Violet color deviates maximum because it has minimum wavelength (λ ≈ 4000Å) and maximum refractive index. Red color deviates minimum because it has maximum wavelength (λ ≈ 8000Å) and minimum refractiv…
Define dispersion of light and explain its cause.
Answer
Dispersion is the phenomenon of splitting of white light into seven constituent colors (VIBGYOR) when it passes through a prism. Cause: Different colors travel at different speeds in a medium because …
What is a spectrum? Distinguish between pure and impure spectrum.
Answer
Spectrum is the beautiful pattern of seven colors obtained when white light passes through a prism. Pure spectrum: Sharp boundaries between colors, no overlapping. Impure spectrum: Colors merge into e…
Arrange the colors of visible light in order of increasing wavelength and state their approximate ranges.
Answer
Violet (4000-4460 Å) → Indigo (4460-4640 Å) → Blue (4640-5000 Å) → Green (5000-5700 Å) → Yellow (5700-5920 Å) → Orange (5920-6200 Å) → Red (6200-8000 Å). Remember VIBGYOR for increasing wavelength ord…
Define electromagnetic spectrum and list its components in order of increasing wavelength.
Answer
Electromagnetic spectrum is the orderly classification of electromagnetic waves according to their frequency or wavelength. Order (increasing wavelength): Gamma rays → X-rays → Ultraviolet rays → Visi…
What are electromagnetic waves? List their key characteristics.
Answer
Electromagnetic waves consist of changing electric and magnetic fields. Characteristics: (1) Do not require medium, (2) Travel at 3×10⁸ m/s in vacuum, (3) Frequency remains same during refraction/refl…
Compare visible and invisible spectrum with examples.
Answer
Visible spectrum: Wavelength 4000-8000 Å, can be detected by human eye, includes VIBGYOR colors. Invisible spectrum: Cannot be detected by human eye, includes ultraviolet rays (shorter than violet) an…
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