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According to Huygens' principle, during ...

According to Huygens' principle, during refraction of light from air to a denser medium

A

wavelength and speed increase

B

wavelength decreases but speed increases

C

wavelength and speed decrease

D

wavelength increases but speed decreases

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According to Huygen's principle, during the refraction of light from air to a denser medium then both wavelength and speed decrease.
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