why white light split into 7 colours when passed through prism
Answers
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⭐. The speed of light is constant in vaccum for all colours , but it depends on the wave length of light when it passes through a medium.
⭐. We know that refractive index of a medium depends on wavelength of light
⭐. When white light passes through a medium , each colour selects its least time path and we have refraction of different colours to different extents.
⭐. This results in seperation of colours , producing a spectrum.
⭐. It has been experimentally found that refractive index decreases with an increase in wavelength.
⭐. In VIBGYOR , red colour has longest wavelength and voilet colour has shortest wave length . The refractive index of red is low , hence it suffers low deviation.
Answer:
Explanation:
This is due to the phenomenon of dispersion of white light,this happens due to change of medium.