CNA itself is 90% owned by a holding company, Loews Corporation.This holding company also has interests in offshore oil and gas drilling rigs, natural gas transmission pipelines, oil and gas exploration, and in hotel operations.n May 3, 2005, CNA said it would restate financial results for prior years to correct its accounting for several reinsurance contracts, mainly with a former affiliate, and its equity accounting with this affiliate.
Refraction is a test that optometrists and ophthalmologist use to measure a person's refractive error. a refractive error is when your eye does not bend light coming into your eye properly as it passes through the cornea, the crystalline lens and fluid media to come to a sharp, clear focus onto your retina.
When we refer to the index of refraction of a substance, we mean its absolute index, since the absolute index of refraction of air is so close to n = 1. For example: n water = 1.33 and n glass = 1.50.In practice, it is determined by the slope of a graph of sine r = f (sine i), where air is the refracting medium.ndex of refraction. The index of refraction index is the ratio of the sine of the angle of incidence to the sine of the angle of refraction. The refractive index is a number with no units and a vacuum is defined as having the lowest index of refraction (n = 1). There are two types of indexes of refraction: