Multiple choice

When a ray of light is transmitted from air to glass the frequency

  1. increases and wavelengh decreases

  2. decreases and wavelength increases

  3. is unaltered but the wavelength decreases

  4. is unaltered but the wavelength increases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The frequency of light remains constant when it passes from one medium to another because it's determined by the source. However, the wavelength decreases in glass because light travels slower in the denser medium (v = f×λ, and n=c/v). The relationship is: λ_glass = λ_air / n_glass.

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