Question

When a ray of light enters a glass slab, Its wavelength
(A) increases
(B) decreases
(C) remains unchanged (D) date are not complete​

Answer 1

Answer:

When a ray of light enters a glass slab from air then its speed decreases as it encounters a dense medium. Since to conserve energy (which is dependent solely on frequency), the frequency must remain constant, the wavelength of light changes. Wavelength is decreased by a factor called refractive index of the medium.