State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.

State the cause of dispersion of white light passing through a glass p

1.	State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
Answer» SOLUTION :Cause of DISPERSION of white light : Different colours of light bend through different angles with respect to the incident ray as they pass through a prism. VIOLET light bends the most and RED the least. Thus, each colour EMERGES along different paths.