Crest of a wave acts as
Correct answer: B. Convex lens
- A. Concave lens
- B. Convex lens
- C. Convex mirror
- D. Plane mirror
Explanation
The crest acts as convex lens while the trough acts as concave lens. Therefore, the bright spot on the screen is the crest because the light rays converge while the dark spot is the trough because the light rays diverge.
This question appeared on the NUMS 2022 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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