When the Newton's ring interference_ is seen from above by means of reflected light. The central spot always appears:
Correct answer: B. Black
- A. White
- B. Black
- C. Red
- D. Green
Explanation
Black: The central spot appears black when destructive interference occurs, causing the incident and reflected waves to cancel each other out, resulting in minimum brightness or complete darkness at the center.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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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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