1. the ability of a substance to refract light or other electromagnetic radiation
Usage: physics; optics

Examples

• The refractivity of water causes objects underwater to appear bent or distorted.
• Scientists measured the refractivity of various glass samples to determine their optical properties.
• The atmosphere’s refractivity affects how radio waves propagate through the air.
• Diamond has high refractivity, which contributes to its brilliant sparkle.
• The refractivity index helps engineers design better optical instruments.
• Changes in temperature can alter the refractivity of certain materials.