___________ of electromagnetic radiation is visible to the human eye.
Isaac Newton discovered that __________ is a mixture of lights of many different wavelengths.
__________ is a result of light from distant objects falling short of the retina, causing distant objects to appear blurry.
Describe the trichromatic theory of color vision.
Responses may vary but should include some or all of the following information: The trichromatic theory of color vision states that humans have three types of receptors within the eye that vary in sensitivity to different light wavelengths. The three receptors are usually associated with the colors red, green, and blue. People can see a variety of colors because the eye mixes colors together by varying activity among the three receptors.
Describe the reason why humans have a blind spot in their vision.
Responses may vary but should include some or all of the following information: Humans have a blind spot because there is a hole in the retina called an optic disk, which is where the optic nerve fibers exit the eye. Humans are unable to see an image that falls within that area of the eye because it does not contain any rods or cones.
Describe the difference between the retina’s two photoreceptor cells.
Responses may vary but should include some or all of the following information: A cone is a visual receptor that assists individuals in processing daytime vision and color. A rod is a visual receptor that assists individuals in processing nighttime and peripheral vision.
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