A ray of light of red colour travelling in air enters into water, its colour will become/remain {Refractive index of water =4/3} :-
(a)Red
(b)Blue
(c)Yellow
(d)Green
Answers
This is because when light enters a denser medium ( water ) from a rarer medium ( air ) it's frequency does not change.
What changes is the wavelength of the light...
although it is a common misconception that colour of light depends upon the wavelength, but this is only true for light when it travels in a particular medium such as air. During refraction wavelength changes (which apparently does not effect the colour of light in this case ) but frequency does not therefore colour remains same i.e. red.
Answer:
A ray of light of red color traveling in air enters into water, its color will remain red.
Explanation:
Refraction is the phenomenon of bending light when the light passes from one optical medium to another optical medium. The optical mediums are of two types. They are denser mediums like water and rarer mediums like air.
When light passes through the rarer medium to the denser medium, it bends towards the normal, and on passing from denser to rarer bends away from the normal.
In another phenomenon called dispersion of light, the white beam of light has seven different colors (red, orange, yellow, green, blue, indigo, and violet) and disperses on passing through a prism-like denser medium.
This occurs due to the different wavelengths of different colors of visible light. The red color has the longest wavelength which is 7×10⁻⁷ m whereas violet has the shortest wavelength(4ˣ10⁻⁷m).
So, the red color deviates least and appears above all other colors of light and violet deviates the maximum by appearing below the spectrum.
Therefore, a ray of light of red color traveling in air enters the water, its color will remain the same since red has the single color of light and change in color of light is irrespective of refractive index of a denser medium (water).