A number of factors can lead companies to close stores. One is mergers and acquisitions activity. As organizations join forces under a single umbrella, locations that once competed for sales can become redundant, leading to store closings.
There are 3 types of ultraviolet (UV) rays: 1  Ultraviolet A rays (UVA) make up most of the sun's natural light. They can penetrate deep into the skin, causing wrinkles and premature aging of the skin.  Ultraviolet B rays (UVB) are the main cause of sunburn. They are nearly 1,000 times stronger than UVA rays.
Because the laser can penetrate a sample deeper than light from a bulb, you can create a three-dimensional image from a selected depth of the specimen. So you can examine interior structures of a non-opaque specimen, or look at the surface of an opaque specimen as deep as the laser light can penetrate.