UV Light and Your Skin

Which statement about the interaction of UV radiation and the skin is correct?

Pigmentation in the skin occurs in

UV radiation can cause redness in the skin. This occurs by:

How can customer's skin type be assessed?

The important pigmentation for "tanning" by means of UV radiation is:

The tanning of the skin is determined by:

For tanning of the skin, the following radiation is important:

Of the optical radiation, two types of radiation can reach the retina; these are:

The following can be stated about the thickness of skin layers:

One can divide the skin roughly into the following layers