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Question

In fig 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 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 ?


Solution

(a) Constituent colours of white light are seen on the screen after dispersion through the prism.


(b) When a slit is introduced in between the prism and screen to pass only the light of green colour, only green light is observed on the screen.

(c) From the observation, we conclude that prism itself produces no colour.

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