Answer :
The focal length (in meters) of a lens = 18.4 m
What do you meant by focal length?
When a lens is focused at infinity, the focal length of the lens is discovered. We can determine the angle of view, or how much of the scene will be captured, and the magnification, or how big the individual elements will be, by measuring the focal length of the lens. A narrower field of view and a higher magnification result from a longer focal length.
According to the given information:
Radius of curvature is 9.2 m.
A refractive index 1.2.
The focal length (in meters) of a lens =
We know that the formula for focal length:
focal length = 2 * radius of curvature
So,
Putting the value in the formula :
we get
focal length = 2 * 9.2
= 18.4 m
The focal length (in meters) of a lens = 18.4 m
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