A light ray enters from air into glass. How does its speed, frequency, and wavelength change?
A. Speed decreases, frequency remains same, wavelength decreases.
B. Speed increases, frequency remains same, wavelength increases.
C. Speed remains same, frequency decreases, wavelength increases.
D. Speed decreases, frequency decreases, wavelength decreases.
Answer: Option A
Solution (By JKSSB Mock Tests)
When light passes from a rarer medium (air) to a denser medium (glass), its speed decreases due to the higher refractive index. Wavelength is directly proportional to speed, so it also decreases. However, the frequency depends only on the source of light and remains absolutely constant during refraction across any boundary.
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