When light is refracted into a medium
A. its wavelength and frequency remain unchanged
B. its wavelength increases but frequency remain unchanged
C. its wavelength decreases but frequency remain unchanged
D. its wavelength anf frequency both decrease

When light is refracted into a medium
A. its wavelength and frequncy both increase
B. its wavelength increase and frequncy remains unchanged
C. its wavelength decrease and frequncy remains unchanged
D. its wavelength and frequncy both decrease

When light is refracted into a medium
A. its wavelength and frequency both increase
B. its wavelength increases but frequency remain unchanged
C. its wavelength decreased but frequency remain unchanged
D. its wavelength and frequency both decreased