i.
The phenomenon
of splitting of light into its component colours is dispersion of light.
ii.
The band of
coloured components of a light beam is called it’s spectrum.
iii.
When White light
is dispersed into seven colours by a prism, different colours of light bend
through different angles with respect to incident ray.
iv.
Out of these
seven colours, red light bend the least while violet light bends the most.
v.
So the rays of
each colour emerge along different paths and become distinct.
vi.
Hence we get a
spectrum of seven different colours in the sequence, Violet, Indigo, Blue,
Green, Yellow, Orange and Red.
