Skin SciencesQuestion 47 of 100
How do UVA and UVB rays differ in their effect on skin?
a.UVA penetrates more deeply and contributes to aging and pigmentation, while UVB primarily affects the epidermis and causes sunburn
b.UVB penetrates the dermis and UVA cannot reach the skin
c.UVA is blocked by window glass while UVB passes through freely
d.Only UVB contributes to skin cancer risk
Explanation
UVA has a longer wavelength that reaches the dermis and drives photoaging and pigment changes, while shorter UVB rays are the main cause of burning at the epidermal level. UVA passes through window glass more readily than UVB, not the reverse. Both wavelengths contribute to skin cancer risk, which is why broad-spectrum protection is recommended.
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