![]() it is a geometrical method to find the wavelengthĪns: B. Huygens’s concept of secondary wave is a geometrical method to find the wavelength.allow us to find the focal length of the thick lens.Huygen considered light needs a medium to propagate called either as highly elastic and less dense. Q2. According to Huygen’s Principle, the ether medium pervading entire universe is:Īns: B. Ray optics is valid when characteristic dimensions are much larger than the wavelength of light so that the rectilinear property of light can be used. much larger than the wavelength of light.Īnswer: C.much smaller than the wavelength of light.of the same order as the wavelength of light.Q1. Ray optics is valid when characteristic dimensions are: Refraction and Reflection of Plane Waves using Huygens Principle.Interference of Light Waves and Young’s Experiment.Coherent and Incoherent Addition of Waves. ![]() ![]() It fades gradually because more and more waveforms are formed.ĭownload Wave Optics Cheat Sheet by clicking on the button below The disturbance does not last for a long time. The primary wavefront is formed and again from the primary wavefront, a secondary waveform is formed and so on. So at every point, we have a wave coming out. The wavefronts gradually spread in all the directions. These ripples are nothing but the wavefront. The ripples form the concentric circle around the disturbance and spread out. But the moment we throw the stone in the water, within a few fractions of seconds the disturbance spreads in all directions. Every point on the surface of water starts oscillating. What do you observe? You see that the stone strikes the surface of the water and waves are seen surrounding that point. This means that, suppose you are standing on the mountain and you throw a stone in the water from a height. Tangent drawn to all the wavelets is the new position of the waveform. So the wavefronts will in the forward direction. So if we consider a point source, it will emit its wavefront and nature of the wavefront will be spherical one.Īs per the Huygen’s principle, all the points on the wavefront are going to become a secondary source. It states that each point of the wavefront is the source of the secondary wavelets which spread out in all direction with the speed of a wave.
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