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Sagot :
An intensity minimum is found for 450 nm light transmitted through a transparent film in air. (a) 45 nm is minimum thickness of the film (b) if this wavelength is the longest for film the intensity minimum occurs.
Light intensity is the amplitude of light with the same wavelength, and light wavelength is a property of light that determines the colors of the light. The majority of marine invertebrates' pelagic larval development can be influenced by light. An earlier study found that while 82% of 141 different oceanic larvae responded favorably to light, excessive light led to photonegative behavior. Additionally, interesting wavelength-dependent phototaxis features are seen in invertebrate larvae. According to Baker and Mann (1998), whereas most long-wavelength lights are normally ineffective at eliciting a response from planktonic invertebrates, Crassostrea virginica larvae are able to do so. Plankton and dissolved organic matter in water absorb sunlight, which is a mixture of visible light, ultraviolet light, and infrared light. This causes a diversity of light intensities and colors on various water levels. Previous research shown a strong correlation between plankton phototactic behaviors and the eyespot's pattern of wavelength absorption. According to a study, Crassostrea gigas larvae's eyespot may effectively absorb light with a wavelength of 500 to 650 nm, especially in the pigmented region.
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