PLEASE HELP!!!! 7. What possible optical mechanisms could contribute to the unus
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PLEASE HELP!!!!
7. What possible optical mechanisms could contribute to the unusual, bright coloring of this lizard species? WAVELENGTH (nm) WAVELENGTH (nm) WAVELENGTH (nm) Figure 2. Spectral reflectance curves of lizard scales reflecting ultraviolet (UV), blue, and brown. 8. Which curve corresponds to which color lizard scale? . UV * Blue Brown - 9. Judging from the curves in Figure 2, do you suspect that lizards might not have the same visual spectrum as humans? Explain 10. If you put a bright blue lizard in a room that was completely devoid of all light, what color would it be?Explanation / Answer
7) The unusual coloring system in case of lizards depends on their structural changes of the body on how they reflect the incident light. Scientists found two superposed and thick iridophore cell layers. These are iridescent cells which reflect light and they also contain pigments. These cells are composed of various nanocrystals which vary in size and shape etc. The chameleon can change its structural arrangement in the body of the cells layers when it relaxes or gets excited and thus unusual color occurrences are observed. For example, when a lizard gets excited by seeing a rival male, the distance between the nanocrystals increase. As a result, the longer wavelength of light such as yellow, orange, red etc. is reflected by the iridescent cells. When the chameleon is relaxed, the distance between the nanocrystals is small and so a smaller wavelength of light such as blue light gets reflected. Lizard also contains some yellow pigment and due to this, the green light is observed when the blue light gets mixed with yellow. This color helps it to camouflage.
However, the color changing pattern is more common in case of male lizards. The female and children are rather dull colored and they have less amount of iridophore cells.
This phenomenon also depends on the laws such as Bragg's law and the rules of coherent scattering depending on the amount of incident layers and the distance of the reflective layers.
8) UV - 2nd curve
Blue - 3rd curve
Brown - 1st curve.
9) Yes. The visual spectrum of lizards differs than humans. Humans have 3 types of color receptors and we can't detect all the electromagnetic spectrum, the light in UV region included in that. Lizards have a tetrachromatic vision and they have retinas with four classes of cones for better color perception. Hence they can percept colors between red, green, yellow, blue. They have good photoreceptors for the UV region.
10) If a bright blue lizard is put in a room that was completely devoid of light, it would appear as white as superimposing blue with dark gives the white appearance.
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