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 respond to light exposure by changing colour. Their molecules undergo a reversible change when they absorb light, especially ultraviolet light, so in bright conditions they darken and in dim conditions they return to their original colour. They don’t rely on temperature, sound, or magnetic fields to trigger the colour change, which is why light levels are the correct cause.

Photochromic materials respond to light exposure by changing colour. Their molecules undergo a reversible change when they absorb light, especially ultraviolet light, so in bright conditions they darken and in dim conditions they return to their original colour. They don’t rely on temperature, sound, or magnetic fields to trigger the colour change, which is why light levels are the correct cause.

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