The Two types of light sensitive cells in the retina are Rods and Cones.
Rods – Are stimulated in dim light( black and while)
Cones – Help us to see colors under high light intensity.
Radial muscle – contracts pupil get wider in bright light
Circular muscle – in dim light these muscles contact and pupil in size reduces.
Three types of cones are
Sensitive to red light
Sensitive to green light
Sensitive to blue light