Question

What is the function of rods and cone cells?

• A. conversion of light to heat signals
• B. formation of image
• C. increase/decrease the focal length of eye lens
• D. Conversion of light into eletrical cells

Answer 1

The correct option is D

Conversion of light into eletrical cells

Rods and cones are photoreceptors (light-sensitive cells) that are present all over the retina of the human eye. These are the cells which are responsible for converting light to electrical signals so that they can be transmitted to the brain by the optic nerve. Rods work at a very low level of lights so they're mostly used for night vision whereas cones require a lot of light and can perceive colour.