Photochromic materials change colour in response to changes in what?

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Multiple Choice

Photochromic materials change colour in response to changes in what?

Explanation:
Photochromic materials change colour in response to light levels. They contain molecules that undergo a reversible change when exposed to light, especially UV light: a colourless form and a coloured form. In bright light, the molecules shift to the coloured form, darkening the material, and when the light fades they revert back to the colourless form. This is why sunglasses with photochromic lenses darken outdoors and lighten indoors. It isn’t driven by temperature, magnetic fields, or sound, which involve different mechanisms and materials.

Photochromic materials change colour in response to light levels. They contain molecules that undergo a reversible change when exposed to light, especially UV light: a colourless form and a coloured form. In bright light, the molecules shift to the coloured form, darkening the material, and when the light fades they revert back to the colourless form. This is why sunglasses with photochromic lenses darken outdoors and lighten indoors. It isn’t driven by temperature, magnetic fields, or sound, which involve different mechanisms and materials.

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