What does the term 'coherent source of light' mean?
Correct answer: C. Single wavelength
- A. Multiple wavelengths
- B. Double wavelength
- C. Single wavelength
- D. Coherent photons
Explanation
Coherent sources of light are those sources that emit a light wave having the same frequency, wavelength, and phase, or they have a constant phase difference. A coherent source forms sustained interference patterns when superimpositions of waves occur and the positions of maxima and minima are fixed.
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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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