Spectrum
ICSE · Class 10 · Physics
Flashcards for Spectrum — ICSE Class 10 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allState the formula for total deviation through a prism.
Answer
Formula: δ=δ1+δ2 Meaning: The total deviation is the sum of deviations at the two refracting surfaces. Units: δ, δ1, δ2 are angles, so the unit is degree or radian. Quick example: If δ1 = 10° and δ2 =…
State the relation between deviation, refractive index, and angle of prism.
Answer
Formula: δ=(μ-1)A Meaning: Deviation depends on refractive index of glass, μ, and angle of prism, A. Units: δ and A are angles; μ has no unit. Quick example: If μ increases, deviation also increases f…
A prism produces deviations of 12° and 18° at its two surfaces. Find the total deviation.
Answer
Given: δ1 = 12°, δ2 = 18° Formula: δ=δ1+δ2 Step 1: Substitute values δ = 12° + 18° Step 2: Add δ = 30° Answer: Total deviation = 30°…
Why does a ray of light deviate when it passes through a prism?
Answer
A ray of light changes speed when it enters and leaves the prism, so its path bends. Since a prism has two refracting surfaces, the ray deviates twice. The final deviation is the combined effect at bo…
Which colour deviates least and which colour deviates most in a prism?
Answer
Red light deviates least, and violet light deviates most. Reason: Refractive index of glass increases as wavelength decreases. Violet has the shortest wavelength among visible colours, so it suffers m…
A light ray has wavelength 4000 Å in a prism and another has wavelength 8000 Å. Which one deviates more?
Answer
The 4000 Å ray deviates more. Reason: Smaller wavelength means higher refractive index for glass and greater deviation. Violet colour has wavelength about 4000 Å and suffers maximum deviation. Red col…
State Cauchy's relationship for refractive index.
Answer
Formula: μ=A+B/λ² Meaning: Refractive index μ depends on wavelength λ. A and B are constants. As λ decreases, μ increases. This explains why violet light deviates more than red light.
Why does white light split into seven colours through a prism?
Answer
White light is polychromatic, so it contains seven colours in the order VIBGYOR. Different colours travel with different speeds in the prism because refractive index depends on wavelength. As a result…
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