When light enters from air into a medium, its speed changes. Which of the following properties of light remains constant during this transition?

Correct option is B

The correct answer is (b) Frequency.
• When light passes from one medium to another, its speed and wavelength change due to refraction.
• The frequency of light remains constant because it is determined by the source of light, not the medium.
Information Booster:
• Refraction occurs due to a change in optical density of the medium.
• Speed of light is maximum in vacuum (≈ 3 × 10⁸ m/s).
• Relationship: v = fλ, where frequency [f] remains constant.
• Laws of refraction were quantitatively explained by Snell in 1621.
Additional Knowledge:
• Amplitude affects intensity, not frequency.
• Change in wavelength causes phenomena like dispersion.