In the figure given below a narrow beam of white light is shown to pas

1.	In the figure given below 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. (i) State the colour seen at X and Y. (ii) Why do different colours of white light bend through different angles with respect to the incident beam of light?
Answer» (i) X – Violet Y – Red (ii) This happens due to the following reasons: (a) Due to difference in speed of different colours (b) Due to difference in wavelength and frequency (c) Due to refractive index of glass is different for different colours of light.

In the figure given below 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. (i) State the colour seen at X and Y. (ii) Why do different colours of white light bend through different angles with respect to the incident beam of light?

Answer»

(i) X – Violet

Y – Red

(ii) This happens due to the following reasons:

(a) Due to difference in speed of different colours

(b) Due to difference in wavelength and frequency

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