Name the colours of the visible spectrum.

The colour of which part of the eye determines the colour of the eye of a person?

In the case of the human eye,when light rays enter the eye,most of the refraction occurs at the

Define dispersion of white light and name the colours of white light in order.

$A$ 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.

What is the iris?