In the shadow of a ball the central portion appears bright that happens due to_________________?
Correct answer: B. Diffraction
- A. Interference
- B. Diffraction
- C. Polarization
- D. Refraction
Explanation
The bright central spot behind a circular opaque ball is the Poisson or Arago spot, produced by diffraction and constructive interference of waves around the ball's edge. Students may choose interference alone, but interference is the mechanism within the broader diffraction phenomenon.
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About Optics
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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