Refraction of Light
ICSE · Class 10 · Physics
Quick revision notes for Refraction of Light — ICSE Class 10 Physics. Key concepts, formulas, and definitions for last-minute revision.
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Basic Concepts of Refraction
- Refraction is the bending of light when it passes from one transparent medium to another due to change in speed
- Light travels at different speeds in different media - faster in rarer medium (air) and slower in denser medium (glass, water)
- At the interface, light undergoes partial reflection and partial refraction
Laws of Refraction and Factors Affecting Refraction
- First Law: The incident ray, refracted ray, and normal at point of incidence lie in the same plane
- Second Law (Snell's Law): The ratio sin i/sin r is constant for a given pair of media
- Quantities affected by refraction: speed (always changes), direction (changes for oblique incidence), wavelength (changes), frequency (remains constant)
Refraction Through Prisms
- Prism: A transparent medium with triangular cross-section bounded by five plane surfaces
- Key angles: angle of prism (A), angle of incidence (i), angle of emergence (e), angle of deviation (δ)
- Ray bends towards base of prism due to refraction at both surfaces
Real and Apparent Depth
- Objects in water appear closer to surface than their actual position due to refraction
- Real depth is the actual depth of object in the medium
- Apparent depth is the depth at which object appears when viewed from another medium
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