Question

A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram. Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE. (i) Write the name and cause of the phenomenon observed. (ii) Where else in nature is this phenomenon observed ? (iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.

Answer 1

1) name of the phenomenon is called dispersion of light.
2) it is made up of these 7 colours
    

Answer 2

1) Dispersion of light

Cause:Different colours of white light bends through different angles with respect to incident ray,Thus the rays of each colour emerge from different paths and become distict. It is the band of colours that we see in a spectum

2) In rainbow

3)The white is consist of seven colours ,VIBGYOR -Violet,Indigo,Blue,Green,Yellow,Orange,Red.