Which item commonly uses photochromic materials?

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Prepare for the Leaving Certificate Technology – Materials exam. Enhance your knowledge with multiple choice questions and detailed explanations. Ace your exam!

Multiple Choice

Which item commonly uses photochromic materials?

Explanation:
Photochromic materials change their color or tint when exposed to light, especially UV light. Sunglasses use this property so the lenses automatically darken in bright sun and become clearer indoors, giving eye protection without needing to switch glasses. The other items—copper wire, steel beams, and solder—are chosen for electrical or structural purposes and don’t undergo reversible color changes with light, so they don’t provide automatic shading.

Photochromic materials change their color or tint when exposed to light, especially UV light. Sunglasses use this property so the lenses automatically darken in bright sun and become clearer indoors, giving eye protection without needing to switch glasses. The other items—copper wire, steel beams, and solder—are chosen for electrical or structural purposes and don’t undergo reversible color changes with light, so they don’t provide automatic shading.

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