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Plane parallel wave fronts encounter the interface between one medium and another, as shown below (lines represent crests). The wave speed is different in the two media. Choose the correct option.

Correct answer: C. The distance between wave fronts and the direction of wave front both changes

  • A. The distance between wave fronts remains unchanged but the direction of wave front changes
  • B. The distance between wave fronts and the direction of wave front both remain unchanged
  • C. The distance between wave fronts and the direction of wave front both changes
  • D. The distance between wave fronts changes but the direction of wave front remains unchanged

Explanation

The distance between wave fronts and the direction of wave front both changes because wavelength and direction of propagation changes.

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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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