When light travels from one medium to another medium of different refractive index, then the wave will have change in its:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Wavelength and velocity only
When a wave is refracted at a boundary, its frequency is fixed by the source, and it does not change on entering another medium. The speed depends on the medium, \( v = c/n \), and the wavelength follows from \( v = f\lambda \).
\( \displaystyle v = \frac{c}{n} \qquad \lambda = \frac{v}{f} \)
NCERT (2026-27):
Refraction of a Plane Wave – “… The above equation implies that when a wave gets refracted into a denser medium (v1 > v2) the wavelength and the speed of propagation decrease but the frequency ν (= v/λ) remains the same.”