![]() The wavelets shown were emitted as each point on the wavefront struck the mirror. Reflection: Huygens’s principle applied to a straight wavefront striking a mirror. The ray bends toward the perpendicular, since the wavelets have a lower speed in the second medium. Huygens’s Refraction: Huygens’s principle applied to a straight wavefront traveling from one medium to another where its speed is less. shows visually how Huygens’s Principle can be used to explain reflection, and shows how it can be applied to refraction. The principle is helpful in describing reflection, refraction and interference. This principle works for all wave types, not just light waves. The new wavefront is tangent to the wavelets. The emitted waves are semicircular, and occur at t, time later. Where s is the distance, v is the propagation speed, and t is time.Įach point on the wavefront emits a wave at speed, v. Then calculate the wavelength of each colour.ĭetermination of wavelength for prominent lines.Note the readings on the verniers and calculate the diffraction angle.Telescope is moved to make the cross-wire coincide with each line of the spectrum.To calculate the wavelegth of different lines Then from the equation, number of lines per unit length of the grating can be calculated. Calculate the difference in the reading to obtain the diffraction angle. ![]()
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