In the given figure, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism it produces a spectrum XY on a screen

CBSE Class 10 CBSE Class 10 Science
, , ,
1

In the given figure, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism it produces a spectrum XY on a screen.

  1. State the colour seen at X and Y.
  2. Why do different colours of white light bend through different angles with respect to the incident beam of light?
    image

Answer:

  1. X — Violet Y — Red
  2. Different colours of white light bend through different angles with respect to the incident beam of light due to difference in speed of light of different wavelengths.
2

can X be blue also?as it also deviates the most.

3

X cannot be blue as it is not the shortest wavelength. since violet has the shortest wavelength X has been chosen as violet.