Question

When a ray enters into air from glass slab
a) its wavelength decreases
c) its frequency increases
b) its wavelength increases
d) its frequency decreases

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Answer 1

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.

Answer 2

Answer:

it's wavelength increase