Q120 (CGS/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Why is sunscreen lotion used while moving out during daytime in summer?

To reduce the exposure to all harmful radiations present in sunlight

To reduce the exposure to harmful infrared radiations present in sunlight

To reduce the exposure to harmful ultraviolet radiations present in sunlight

To reflect the visible radiations by the body surface to glow

Result

Your answer: — · Correct: C

Explanation

Sunscreen lotions are primarily formulated to protect the skin from Ultraviolet (UV) radiation emitted by the sun. Solar radiation reaching the Earth consists of infrared (IR), visible light, and ultraviolet rays. UV radiation is categorized into UVA (320–400 nm) and UVB (290–320 nm). While UVB is the main cause of sunburns, both UVA and UVB can cause DNA damage, premature skin aging, and increase the risk of skin cancer.

Chemical sunscreens absorb UV rays and convert them into heat.
Physical sunscreens (containing zinc oxide or titanium dioxide) reflect and scatter UV rays.

Option A is incorrect because sunscreen does not protect against all types of radiation. Option B is incorrect as infrared radiation is primarily felt as heat and is not the primary target of standard sunscreens. Option D is incorrect as the goal is protection, not aesthetic glowing through reflection.

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Why is sunscreen lotion used while moving out during daytime in summer?

Explanation

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