What does the 'SPF' number on a sunscreen primarily measure?
a.Protection against UVB radiation
b.Protection against infrared radiation
c.Hours the product lasts on the skin
d.Protection against UVA radiation
Explanation
SPF (Sun Protection Factor) measures protection against UVB rays, which cause sunburn. For UVA protection (which causes aging), look for 'broad-spectrum' on the label.
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