Optics — Flashcards
Tamil Nadu Board · Class 10 · Science
30 flashcards for Optics (Tamil Nadu Board Class 10 Science) to test yourself on key terms and facts. Sample: "What are the main properties of light that"
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What are the main properties of light that you must remember?
Answer
Key properties of light: 1. Light is a form of energy 2. Light travels in straight lines 3. Light does not need a medium - it can travel through vacuum 4. Speed of light in vacuum: c = 3 × 10⁸ m/s 5.
State the two laws of refraction of light.
Answer
First Law of Refraction: The incident ray, the refracted ray, and the normal to the refracting surface all lie in the same plane. Second Law of Refraction (Snell's Law): The ratio of the sine of angl…
What is refractive index? How is it calculated?
Answer
Refractive Index (μ) Definition: The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in that medium. Formula: μ = c/v Where: - c = speed of light in v…
Light travels from vacuum into glass with refractive index 1.5. If angle of incidence is 30°, calculate the angle of refraction.
Answer
Given: - μ₁ = 1.0 (vacuum) - μ₂ = 1.5 (glass) - i = 30° - r = ? Using Snell's Law: μ₁ sin i = μ₂ sin r 1.0 × sin 30° = 1.5 × sin r 1.0 × 0.5 = 1.5 × sin r 0.5 = 1.5 × sin r sin r = 0.5/1.5 = 0.333 r …
What is dispersion of light? Why does white light split into a spectrum when passing through a prism?
Answer
Dispersion of Light Definition: When white light (composite light) is refracted through a transparent medium like a glass prism, it splits into its component colors. This phenomenon is called dispersi…
What is scattering of light? Name the types of scattering and explain Rayleigh scattering.
Answer
Scattering of Light Definition: When a beam of light interacts with particles (atoms/molecules) in a medium, the light is redirected in all directions. This is called scattering of light. Types of Sc…
Why do clouds appear white while the sky appears blue?
Answer
Blue Sky: - Caused by Rayleigh Scattering - Air molecules are very small (< wavelength of light) - Blue light (shorter wavelength) scatters much more than red (longer wavelength) - Scattered blue ligh…
What are lenses? Classify and describe convex and concave lenses.
Answer
Lens Definition: A lens is an optically transparent medium bounded by two spherical refracting surfaces (or one plane and one spherical surface). Convex Lens (Converging Lens): - Shape: Thicker in th…
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