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Metamaterials derive unusual properties (e.g., negative refraction) from their ________ rather than chemical composition.
- Atomic structure
- Crystal lattice
- Engineered microstructure
- Molecular bonds
Answer: Engineered microstructure
Metamaterials have sub-wavelength structures designed to manipulate EM waves in ways natural materials cannot. Applications: superlenses, cloaking, compact antennas. Active research area in photonics and acoustics. [[NCERT Physics Class 12, DST Reports]]