Class 11-science H C VERMA Solutions Physics Chapter 20 - Dispersion and Spectra
Dispersion and Spectra Exercise 442
Solution 1
For deviation to be zero, flint and crown glass prism are kept inverted to each other.
Deviation of flint prism= Deviation of by crown prism
Solution 2
(a)
(b)
Solution 3
focal length of convex lens
So,
Dispersive power,
Solution 4
Here, 
And,
Now, dispersive power,
Solution 5
Dispersive power
Now,
deviation 
Solution 6
Given
that, 
Dispersive
power= 
=
=
=
=
=0.0206
Solution 7
Since both prism are geometrically identical so their prism angle is same.
Let prism angle be A.
Deviation by both prism will be in both opposite direction.
Solution 8
(a)
Angular dispersion is given by 
For 
(b)
deviation is given by 
For
no net deviation i.e., 
Dispersion and Spectra Exercise 443
Solution 9
Solution 10
(a) 
(b) 
(c)If prisms are similarly directed
(d) If prisms are similarly directed
Solution 11
(a)
(b)
