A beam of monochromatic blue light of wavelength 4200 Å in air travels in water of refractive index 4/3. Its wavelength in waterwill be:(A) 4200 Å (B) 5800 Å (C) 4150 Å (D) 3150 Å
aniket anand , 11 Years ago
Grade
2 Answers
Shubham paliwal
Last Activity: 6 Years ago
Ans. Let wavelength in water = x
So,
4/3 = 4200/x
4x= 4200*3
Therfore,
x = 4200*3/4
x = 12600/4
So, x = 3150 (D)
MATISH BAL
Last Activity: 6 Years ago
4/3 =3x10^8/v ,v=2.25x10^8......(1) ,c=frequency x wavelength ,frequency= 7.14x10^14 hz....(2) ,comparing (1) and(2) ,we get,velocity=frequency x wavelength ,therefore, wavelength= (1)/(2) =3150 A
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