Interference
Q. What is the result of interference when two waves of equal amplitude and opposite phase meet?
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A.
Constructive interference
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B.
Destructive interference
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C.
No interference
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D.
Random interference
Solution
When two waves of equal amplitude and opposite phase meet, they cancel each other out, resulting in destructive interference.
Correct Answer: B — Destructive interference
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Q. What is the result of interference when two waves of equal amplitude and opposite phase combine?
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A.
Constructive interference
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B.
Destructive interference
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C.
No interference
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D.
Partial interference
Solution
When two waves of equal amplitude and opposite phase combine, they cancel each other out, resulting in destructive interference.
Correct Answer: B — Destructive interference
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Q. What is the role of coherence in interference phenomena?
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A.
It determines the intensity of light
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B.
It ensures constant phase difference
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C.
It affects the wavelength
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D.
It changes the speed of light
Solution
Coherence refers to the constant phase relationship between waves, which is essential for producing stable interference patterns.
Correct Answer: B — It ensures constant phase difference
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Q. What is the role of the coherent sources in an interference experiment?
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A.
To provide different wavelengths
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B.
To ensure constant phase difference
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C.
To increase the amplitude
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D.
To decrease the wavelength
Solution
Coherent sources maintain a constant phase difference, which is essential for producing a stable interference pattern.
Correct Answer: B — To ensure constant phase difference
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Q. What is the role of the refractive index in thin film interference?
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A.
It determines the wavelength of light
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B.
It affects the phase change upon reflection
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C.
It has no effect
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D.
It only affects the intensity
Solution
The refractive index affects the phase change upon reflection; a higher refractive index can lead to a phase change of π (180 degrees).
Correct Answer: B — It affects the phase change upon reflection
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