A diverging beam of light from a point source 5 having divergence angle , falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is
and the refractive index
then the divergence angle of the emergent beam is
a) |
Zero |
b) |
|
c) |
|
d) |
|
A diverging beam of light from a point source 5 having divergence angle , falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is
and the refractive index
then the divergence angle of the emergent beam is
a) |
Zero |
b) |
|
c) |
|
d) |
|
(b)
Since rays after passing through the glass slab just suffer lateral displacement hence we have angle between the emergent rays as