When light is refracted into a denser medium,...

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When light is refracted into a denser medium,
• a)
Its wavelength and frequency both increases
• b)
Its wavelength increase but frequency remains unchanged
• c)
Its wavelength decrease but frequency remains unchanged
• d)
Its wavelength and frequency both decrease

Frequency only depends on the source, i.e. frequency changes only when source changes. So, if light ray travels from one medium to another there will be no change in the frequency because the ray still originates from the same source. For any wave,
Lf = c
where, f = frequency, L = wavelength and c = speed of sound
When light travels from one medium to another there will be a change in its velocity. As a result there will be change in its wavelength since there must be no change in the frequency.

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When light is refracted into a denser medium,a)Its wavelength and frequency both increasesb)Its wavelength increase but frequency remains unchangedc)Its wavelength decrease but frequency remains unchangedd)Its wavelength and frequency both decreaseCorrect answer is option 'C'. Can you explain this answer?

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Always remember that frequency is only depends on the source, i.e, frequency changes only when source changes. So, if light ray travels from one medium to another there will be no change in the frequency because the ray still originates from the same source. For any wave,
Lf = c
where, f = frequency, L = wavelength and c = speed of sound
When light travels from one medium to another there will be a change in its velocity. As a result there will be change in its wavelength since there must be no change in the frequency.

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Frequency only depends on the source, i.e. frequency changes only when source changes. So, if light ray travels from one medium to another there will be no change in the frequency because the ray still originates from the same source. For any wave,Lf = cwhere, f = frequency, L = wavelength and c = speed of soundWhen light travels from one medium to another there will be a change in its velocity. As a result there will be change in its wavelength since there must be no change in the frequency.