The condition for destructive interference of two coherent waves is that the path difference should be:
Correct answer: C. Odd integral multiple of λ/2
- A. Integral multiple of λ/2
- B. Integral multiple of λ
- C. Odd integral multiple of λ/2
- D. Even integral multiple of λ/2
Explanation
Destructive interference occurs when the path difference = (2m+1)λ/2 (odd half‑wavelengths), causing waves to be out of phase by π radians and cancel.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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