Visible light - electromagnetic waves in the frequency range 430 to 770 teraHz.
Compound eyes detect motion, and simple eyes detect light. or The compound eyes are used to "see". The simple eyes are used to detect light intensity.
eyes
Because the people whose eyes could not detect visible light didn't surviveto have children. They were completely outclassed, outhunted, and outfoughtby the people whose eyes could detect it.
Black
Our eyes can detect them.
The eye and photosensitive paper both detect visible light.
They can. While human eyes can not "see" infrared light, humans can detect this light as "heat" on the surface of the skin.
Light
Tiny eyes (also called ocelli) that can detect light and dark are located on top of the spiders cephalothorax. They also can detect different wavelengths and intensities of light.
It helps to detect light
our eyes detect the green light that is reflected off the leaf
visible light spectrum