Infrared radiation is visible to the human eye.

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Multiple Choice

Infrared radiation is visible to the human eye.

Explanation:
The eye can only detect a narrow slice of the electromagnetic spectrum, so infrared isn’t visible. Visible light runs about 380 to 750 nanometers; infrared starts around 750 nanometers and extends to much longer wavelengths. The retina’s photoreceptors (cones and rods) are sensitive to visible wavelengths, not to infrared photons, so we don’t see infrared as light. We perceive infrared as heat, and devices like thermal cameras can translate that infrared radiation into images we can see, but the human eye cannot.

The eye can only detect a narrow slice of the electromagnetic spectrum, so infrared isn’t visible. Visible light runs about 380 to 750 nanometers; infrared starts around 750 nanometers and extends to much longer wavelengths. The retina’s photoreceptors (cones and rods) are sensitive to visible wavelengths, not to infrared photons, so we don’t see infrared as light. We perceive infrared as heat, and devices like thermal cameras can translate that infrared radiation into images we can see, but the human eye cannot.

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