66th B.P.S.C. (Pre) 2020
Which of the following does not change when light travels from one medium to another?
aVelocity
bWavelength
cFrequency✓ Correct
dRefractive index
eNone of the above / More than one of the above
Explanation
When a light wave goes from air to glass, or from one medium to another, its frequency remains the same, but its wavelength and speed change.
general-science