Answer:
e less sensitive to dim light and more sensitive to fine detail.
Explanation:
Rods and cones are light sensitive receptors located at the back of the eye. The human eye contains between 5 million and 7 million cones and 110000000-130000000 bars.
Function
Cones and canes are essential for vision. Together they are able to detect movement, light and color, and transmit that information back to the brain.
Rods
The rods are highly sensitive cells located in the outer area of the retina (the lining of the back of the eye). They are used in low light areas and are more acute to light, shape and movement changes. Rubs do not detect color.
Cones
The cones are located in the central fovea (central area of the retina). They are less sensitive than rods and require bright lighting. Cones are fundamental to our ability to see color.
The cones have a high resolution and can detect the color. Its maximum sensitivity is located at a wavelength around 555 nm (yellow light). This is the so-called photopic vision, the one used during the day to see things in detail and color, making use of direct vision, the one with the highest definition. During astronomical observation, cones can also be used in the case of bright objects, such as planets or stars, whose light is intense enough to detect color. Sometimes we will also notice it in deep sky objects, such as planetary nebulae with high surface brightness.
Darkness arrives, when the light diminishes, the canes begin to work. This is the so-called scotopic vision. The rods are located outside the optical axis, with their area of greatest sensitivity located at an angle of approximately 20 ° around the fovea, and a maximum sensitivity at 507 nm (green light) The rods are responsible for night vision , also being the most sensitive motion detectors. The well-known peripheral vision technique uses the rods to detect weak objects at the time of observation.
Here we can notice that the maximum sensitivity between the cones and the rods is different, 555 nm for the former and 507 nm for the latter. This has the effect that during the transition from vision with cones (photopic) to vision with rods (scoopic) the maximum response moves at shorter wavelengths. This is called the Purkinje effect, and it means that for weak sources the eye is more sensitive to blue, while for bright sources it is more red.
