Which parameter remains unaltered during refraction of light?
(a) Velocity
(b) Amplitude
(c) Frequency
(d) Wavelength
WBBSE
Class X
Physical Science
Light – Reflection and Refraction
01 Mark
2025
(c) Frequency
Explanation:
During refraction, a light ray bends because its speed changes when it passes from one medium to another, but the frequency of light remains unchanged for a given colour; refractive index depends on wavelength/colour, not on frequency change.
The wavelength and velocity change in the second medium, but frequency stays the same as it is fixed by the source.
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