A
thin flake of mica
|
Solution: Click For PDF Version I
Let the
thickness of the mica sheet be
When the mica
sheet is inserted as shown in the figure, the optical path
corresponding to ray
It is given that after the mica sheet has been inserted, the central point on the screen is occupied by what used to be the seventh bright fringe. Therefore, we have
|
is used to cover one slit of a double-slit arrangement. The central
point on the screen is occupied by what used to be the seventh bright
fringe. If
,
we have to find the thickness of the mica.
n
the absence of the mica sheet the position of the seventh bright
fringe is given by the condition that
.
.
The refractive index of mica is
.
gets changed to
.