When a light ray passes from one medium to another, then its

When a light ray transitions from one medium to another, such as from air to water, its frequency remains constant (Option B), as frequency is a property of the light wave itself and does not change with the medium. However, the wavelength of the light wave adjusts to accommodate the change in the speed of light between the two media. In denser media like water or glass, where light travels slower than in air, the wavelength decreases (Option D) to maintain the consistent frequency. Option A (wavelength remains the same) is incorrect because wavelength adjusts with the speed of light in different media. Option C (frequency increases) is incorrect because frequency is an intrinsic property of the light wave and does not change with the medium. Understanding these principles helps explain how light behaves as it moves between different environments, affecting its propagation and interaction with matter.