Discussion
Length and itensity of Light wave play an important role in :
Answer: A
Wavelength and intensity determine the perception of colour and brightness.
The wavelength of light is perceived mainly as hue (colour): short wavelengths look violet or blue and long wavelengths red. The intensity (amplitude) of light is perceived mainly as brightness. (The paper prints 'itensity'.)
Illumination is the light falling on a scene, not a perceptual quality produced by wavelength, and constancy is the stability of perception despite changes in the light, not a direct product of wavelength or intensity.
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