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When a ray of light enters a glass slab from air,
  • a)
    its wavelength decreases.
  • b)
    its wavelength increases.
  • c)
    Its frequency decreases.
  • d)
    neither its wavelength nor its frequency changes.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
When a ray of light enters a glass slab from air,a)its wavelength decr...
NOTE : When the ray enters a glass slab from air, its frequency remains unchanged.
Since glass slab in an optically denser medium, the velocity of light decreases and therefore we can conclude that the wavelength decreases. 
(∵ v = vλ)
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