Question

Our color-sensing cones respond primarily to three wavelengths of light. in alphabetical order, those wavelengths are _________, ___________, _________. We see a gradation or spectrum of color because more than one cone type is activated at one time, causing _________________ from more than one cone type.

Answer 1

Answer : blue, green and red (BGR) , action potential or (nerve impulse).

• The retina of the eye has two types of photoreceptor cells, namely rods and cones.
• Rods help in night vision (vision in dim or low light settings) while cone helps in color vision.
• There are three types of cone cells, namely S-cone, M-cone and L-cone.
• S-cone refers to the cone cell sensitive to short wavelength of visible light (blue).
• M-cone refers to the cone cell sensitive to medium wavelength of visible light (green).
• L-cone refers to the cone cell sensitive to long wavelength of visible light (red).
• When the cones are stimulated, they produce an action potential, which travels to the brain and is perceived by the visual cortex.
• When different cones are stimulated at a time, action potential is generated by each stimulated cone resulting in generation of different hues.
• When all the three cones get stimulated at once, white light is observed.