The radius of curvature of the lens is = 80cm
The diameter of the circle formed by a spherical mirror or lens is known as the radius of curvature. The distance between your lens's point of convergence and the sensor is known as the focal length. The measurement of how much a light beam bends as it travels through lens or different medium is called the refractive index.
The relationship between focal length and radius of curvature is that R=2f
Where R = radius of curvature
f= Focal length
Therefore, radius of curvature = 2×40 = 8cm
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