Purple an illusion?????

What is unique about the color purple?

• It is the longest wavelength of light.

• Our brain makes it up.

• It is a pigment found in nature.

• It is part of the visible spectrum.

What is the visible-light spectrum?

• The range of all electromagnetic radiation.

• The range of light wavelengths our eyes can see.

• The range of sound waves we can hear.

• The range of temperatures we can feel.

Which cones in our eyes detect long wavelengths of light?

• Yellow cones

• Blue cones

• Green cones

• Red cones

What does the acronym ROYGBIV help us remember?

• The stages of the water cycle.

• The types of electromagnetic radiation.

• The order of colors in the visible spectrum.

• The order of planets in the solar system.

Why is purple considered a nonspectral color?

• It is a single wavelength of light.

• It is made of two wavelengths of light.

• It is only found in rainbows.

• It is not visible to the human eye.

What happens when light stimulates mostly short-wavelength cones?

• We see blue or violet.

• We see green.

• We see red.

• We see yellow.

What is the role of cones in our eyes?

• They detect pressure.

• They detect temperature.

• They detect certain wavelengths of light.

• They detect sound.

What does the brain do to make sense of purple?

• It bends the visible spectrum into a circle.

• It changes the wavelength of light.

• It uses only red cones.

• It ignores the color.

What is the electromagnetic spectrum?

• The range of sounds we can hear.

• The range of all types of light that exist.

• The range of colors in a rainbow.

• The range of temperatures we can feel.

What is the main function of the pigment epithelium in the eye?

• To produce color.

• To absorb excess light.

• To reflect light.

• To detect sound.