1.

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

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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.



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