1.

A beam of monochromatic blue light of wavelength \[4200\,{AA}\] in air travels in water (\[\mu =4/3\]). Its wavelength in water will be                                                         [MNR 1991; UPSEAT 2000]

A. \[2800\,\,{AA}\]               
B. \[5600\,\,{AA}\]
C. \[3150\,\,{AA}\]               
D. \[4000\,\,{AA}\]
Answer» D. \[4000\,\,{AA}\]


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