Answer:
The focal length for given convex lens = 0.0714 m
Step-by-step explanation:
Given data
Radius (
) = 12.5 cm
Radius (
) = 16.7 cm
Since the radius of curvature is positive so these are the convex lens.
Now focal length is given by
⇒
=
+

⇒ Put the values of
and
in the above formula we get,
⇒
=
+

⇒
= 0.13988
⇒ f =

⇒ f = 7.14 cm
⇒ f = 0.0714 m
Thus the focal length for given convex lens = 0.0714 m