In Newton's rings seen through the reflected light:
Correct answer: B. The central spot is dark
- A. The central spot is bright
- B. The central spot is dark
- C. Both of the above
- D. None of these
Explanation
At the point of contact, the reflected rays suffer a phase inversion, causing destructive interference in reflected light; hence, the central spot appears dark for reflected-light Newton's rings.
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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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