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Question

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.

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