**Hallo prism**

A beam of white light doesn’t experience any dispersion when
it is passed through a Hallo prism. There is no refraction of the light as well
as no dispersion of the light in this case. The glass slab with which the prism
is made is very thin and behaves like a plain glass. Hence the light rays are
passing through it without any dispersion. That is why the when the light is
passing through a Hallo prism, no spectrum of light is generated.

**Problem and solution**

Here we are going to solve some simple problems basing on the
dispersion of the light in the dispersive power. When the angle of prism of a
small angled prism is given and the refractive index for the different colors
is given, we can calculate the angular dispersion between the given to colors
as shown.

In another problem we have calculate the dispersive power for
the given to colors. This is solved just basing on the formula that we had
derived previously.

**Problem and solution**

In this problem in two different prisms who are small angled
prisms, one of the angle of the prism is given and we have to calculate the
angle of the prism of the second prism. The corresponding refractive indices of
these two prisms for a given color were also given. The condition that is given
in the problem is that can be dispersion but not any deviation.

We can solve this problem basing on the condition that is
derived for situation where there can be dispersion but there is no deviation
as shown below.

**Problem and solution**

In the problem we have a small angled prism which is first in
air and then dipped in the water. We need to calculate how does the minimum
deviation is going to be affected when there is a change of the medium.

This can be solved basing on the very definition of the angle
of deviation.

**Problem and solution**

The problem is a combination of two prisms where we need to
get dispersion without any deviation. By substituting the basic condition for
the given situation we can get the angle of the prism as shown below.

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