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When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of
- a)interference
- b)diffraction
- c)dispersion
- d)polarisation
Correct answer is option 'A'. Can you explain this answer?
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When exposed to sunlight, thin films of oil on water often exhibit bri...
When thin films of oil are exposed to sunlight, they often exhibit brilliant colors due to the phenomenon of interference.
Interference is the phenomenon in which waves interact with each other, leading to the reinforcement or cancellation of their amplitudes. When light waves are incident on a thin film of oil on water, they can be reflected from the top and bottom surfaces of the film. If the path length difference between the two reflections is an integral multiple of the wavelength of the light, the waves will interfere constructively, leading to an increase in the intensity of the light. If the path length difference is an odd multiple of half the wavelength of the light, the waves will interfere destructively, leading to a decrease in the intensity of the light.
The colors that are observed in thin films of oil on water are due to the constructive and destructive interference of light waves as they pass through the film. Different colors correspond to different wavelengths of light, and the colors that are observed depend on the thickness and refractive index of the film.
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When exposed to sunlight, thin films of oil on water often exhibit bri...
Explanation:
The phenomenon of brilliant colours observed in thin films of oil on water when exposed to sunlight is due to the interference of light waves. This phenomenon is known as thin-film interference.
Interference of Light Waves:
When two or more waves interact with each other, the resultant wave is determined by the superposition of the individual waves. If the amplitude of the resultant wave is increased, it is called constructive interference. If the amplitude of the resultant wave is decreased, it is called destructive interference.
Thin-Film Interference:
When a beam of light is incident on a thin film of oil on water, a portion of the light is reflected from the upper surface of the film, and a portion of the light is transmitted through the film and reflected from the lower surface of the film. These two reflected waves interfere with each other.
The interference of these two waves can either be constructive or destructive, depending on the thickness of the film and the wavelength of the incident light. If the thickness of the film is such that the reflected waves are in phase, then constructive interference occurs, resulting in bright colours. If the thickness of the film is such that the reflected waves are out of phase, then destructive interference occurs, resulting in dark colours.
Conclusion:
Therefore, the phenomenon of brilliant colours observed in thin films of oil on water when exposed to sunlight is due to the interference of light waves, which is known as thin-film interference. This is the reason why the colours observed in these thin films change when viewed from different angles.
The phenomenon of brilliant colours observed in thin films of oil on water when exposed to sunlight is due to the interference of light waves. This phenomenon is known as thin-film interference.
Interference of Light Waves:
When two or more waves interact with each other, the resultant wave is determined by the superposition of the individual waves. If the amplitude of the resultant wave is increased, it is called constructive interference. If the amplitude of the resultant wave is decreased, it is called destructive interference.
Thin-Film Interference:
When a beam of light is incident on a thin film of oil on water, a portion of the light is reflected from the upper surface of the film, and a portion of the light is transmitted through the film and reflected from the lower surface of the film. These two reflected waves interfere with each other.
The interference of these two waves can either be constructive or destructive, depending on the thickness of the film and the wavelength of the incident light. If the thickness of the film is such that the reflected waves are in phase, then constructive interference occurs, resulting in bright colours. If the thickness of the film is such that the reflected waves are out of phase, then destructive interference occurs, resulting in dark colours.
Conclusion:
Therefore, the phenomenon of brilliant colours observed in thin films of oil on water when exposed to sunlight is due to the interference of light waves, which is known as thin-film interference. This is the reason why the colours observed in these thin films change when viewed from different angles.
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When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon ofa)interferenceb)diffractionc)dispersiond)polarisationCorrect answer is option 'A'. Can you explain this answer?
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