We
have a supply of flat glass disks
|
Solution: Click For PDF Version We will use the lens-maker’s formula
and the sign
convention that
Also,
the radius of curvature of a plane surface is
In the following we calculate the focal length of the six lenses shown in the figure: (a) Double convex lens
We have
(b) Planar convex
We have
(c) Meniscus convex
We have
(d) Double concave
We have
(f) Planar concave
We have
(g) Meniscus concave
We have
|
and a lens grinding machine that can be set to
grind radii of curvature of either 40 cm or
60 cm. We are advised to prepare a set of six
lenses like those shown in the figure. We
have to find the focal length of each lens.
(Note: Where
we have a choice of radii of curvature, we will select the smaller
one.)
,
is positive if the centre of curvature lies in the R-side
of the lens and is negative if the centre of curvature lies in the
V-side of the lens.
.
.
.
.
.
.
