When a light ray from a rarer medium is refracted into a denser medium, its
A
Speed increases, wavelength increases
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B
Speed decreases, wavelength increases
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C
Speed increases, wavelength decreases
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D
Speed decreases, wavelength decreases
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Solution
The correct option is D Speed decreases, wavelength decreases When a light ray goes from rarer to denser medium (optical denser), its speed decreases.
From relation, v=fλ f→ constant (as source remains same) ⇒υ∝ λ
or λ↓ because v↓ in denser medium
Tip: Frequency of a wave is dependent on source only. vλ= constant, provided the source doesn't change.