When a light wave refracts from air into glass:
Correct answer: C. The frequency does not change, but the wavelength decreases
- A. The frequency increases and the wavelength decreases
- B. The frequency decreases and the wavelength increases
- C. The frequency does not change, but the wavelength decreases
- D. The frequency does not change, but the wavelength increases
Explanation
At a boundary, the wave frequency remains fixed by the source; the wave speed reduces in the denser medium, so the wavelength shortens (v = fλ). Thus frequency constant and wavelength decrease in glass.
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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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