Physics
The figure given below, shows a thin beam of white light from a source S striking on one face of a prism.
(a) Complete the diagram to show the effect of the prism on the beam and to show what is seen on the screen.
(b) If a slit is placed in between the prism and the screen to pass only the light of green colour, what will you then observe on the screen?
(c) What conclusion do you draw from the observation in part (b) above?
Spectrum
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Answer
(a) Below diagram shows the effect of the prism on the beam and the spectrum seen on the screen:
A coloured patch like a rainbow is seen on the screen. This is called the spectrum.
(b) When a slit is placed in between the prism and the screen to pass only the light of green colour then only green light is observed on the screen.
(c) With the help of the above experiment we can say that the prism does not produce colours, but it only splits the various colours present in the light incident on it.
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