Q. Monochromatic light of frequency 5 x 10⁴ Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is
A. 5000 A0
B. 4000 A0
C. 5500 A0
D. 6000 A0
Answer: 4000 A0
A. 5000 A0
B. 4000 A0
C. 5500 A0
D. 6000 A0
Answer: 4000 A0
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