Which of the following is nearly monochromatic?
Correct answer: C. Light from sodium lamp
- A. Light from candle
- B. Light from simple lamp
- C. Light from sodium lamp
- D. Light from sun
Explanation
Sodium lamps emit light strongly at the sodium D‑lines near 589 nm, producing nearly monochromatic (narrowband) yellow light compared to broad‑spectrum sources like candles or sunlight.
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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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