To be safe and effective, sunscreen preparations should block
A) UVA only.
B) UVB only.
C) both UVA and UVB.
D) all forms of radiation other than UVA or UVB.

Question

Quizplus · Accepted Answer

Sunscreen preparations should block both UVA and UVB rays in order to provide broad-spectrum protection from harmful radiation. Blocking all forms of radiation other than UVA or UVB would be unrealistic and potentially harmful as some forms of radiation, such as visible light, are not harmful to the skin.

To Be Safe and Effective, Sunscreen Preparations Should Block