Question

Our eyes respond to wavelengths ranging from

• A. $400\mathrm{nm}\mathrm{to}700\mathrm{nm}$
• B. -∞ to +∞
• C. $1\mathrm{mm}\mathrm{to}700\mathrm{nm}$
• D. $700\mathrm{nm}\mathrm{to}800\mathrm{nm}$

Answer 1

The correct option is A

$400\mathrm{nm}\mathrm{to}700\mathrm{nm}$

The explanation for the correct option

In the case of option A,

1. The visible light which the human eye can detect is in the wavelength range of $390\mathrm{nm}\mathrm{to}780\mathrm{nm}$.
2. The graphics show the sensitivity curve that depicts the visible light range of the human eye.
   
3. The human eyes can respond to wavelengths ranging from$400\mathrm{nm}\mathrm{to}700\mathrm{nm}$.

The explanation for the incorrect options

In the case of option B,

1. This is not any specific range of light so the human eye can't detect it.

In the case of option C,

1. $1\mathrm{mm}\mathrm{to}700\mathrm{nm}$ is the wavelength range of infrared rays that can not be seen by a human eye.

In the case of option D,

1. $700\mathrm{nm}\mathrm{to}800\mathrm{nm}$ the wavelength range comes under the near-infrared so can not be detected by the human eye.

Hence, option A is the correct answer.